diff --git a/lib/Api/AccountApi.php b/lib/Api/AccountApi.php
index 920e3fe..2befa0a 100644
--- a/lib/Api/AccountApi.php
+++ b/lib/Api/AccountApi.php
@@ -70,9 +70,9 @@ class AccountApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -266,7 +266,7 @@ protected function getAccountRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -577,7 +577,7 @@ protected function getAccountActivityRequest($startDate = null, $endDate = null,
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/AttributesApi.php b/lib/Api/AttributesApi.php
index add93cd..a200279 100644
--- a/lib/Api/AttributesApi.php
+++ b/lib/Api/AttributesApi.php
@@ -70,9 +70,9 @@ class AttributesApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -286,7 +286,7 @@ protected function createAttributeRequest($attributeCategory, $attributeName, $c
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createAttribute)) {
             $_tempBody = $createAttribute;
@@ -566,7 +566,7 @@ protected function deleteAttributeRequest($attributeCategory, $attributeName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -826,7 +826,7 @@ protected function getAttributesRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1114,7 +1114,7 @@ protected function updateAttributeRequest($attributeCategory, $attributeName, $u
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateAttribute)) {
             $_tempBody = $updateAttribute;
diff --git a/lib/Api/CRMApi.php b/lib/Api/CRMApi.php
index dd67b49..37f1c24 100644
--- a/lib/Api/CRMApi.php
+++ b/lib/Api/CRMApi.php
@@ -70,9 +70,9 @@ class CRMApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -337,7 +337,7 @@ protected function crmNotesGetRequest($entity = null, $entityIds = null, $dateFr
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -595,7 +595,7 @@ protected function crmNotesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -890,7 +890,7 @@ protected function crmNotesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1167,7 +1167,7 @@ protected function crmNotesIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1457,7 +1457,7 @@ protected function crmNotesPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1845,7 +1845,7 @@ protected function crmTasksGetRequest($filterType = null, $filterStatus = null,
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2103,7 +2103,7 @@ protected function crmTasksIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2398,7 +2398,7 @@ protected function crmTasksIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2667,7 +2667,7 @@ protected function crmTasksIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -2941,7 +2941,7 @@ protected function crmTasksPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -3204,7 +3204,7 @@ protected function crmTasktypesGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/CompaniesApi.php b/lib/Api/CompaniesApi.php
index e2216dd..38bd96b 100644
--- a/lib/Api/CompaniesApi.php
+++ b/lib/Api/CompaniesApi.php
@@ -70,9 +70,9 @@ class CompaniesApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -266,7 +266,7 @@ protected function companiesAttributesGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -597,7 +597,7 @@ protected function companiesGetRequest($filters = null, $linkedContactsIds = nul
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -855,7 +855,7 @@ protected function companiesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1150,7 +1150,7 @@ protected function companiesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1456,7 +1456,7 @@ protected function companiesIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1720,7 +1720,7 @@ protected function companiesLinkUnlinkIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1994,7 +1994,7 @@ protected function companiesPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/ContactsApi.php b/lib/Api/ContactsApi.php
index c921ab7..456efca 100644
--- a/lib/Api/ContactsApi.php
+++ b/lib/Api/ContactsApi.php
@@ -311,7 +311,7 @@ protected function addContactToListRequest($body, $listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -587,7 +587,7 @@ protected function createAttributeRequest($body, $attributeCategory, $attributeN
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -870,7 +870,7 @@ protected function createContactRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1108,7 +1108,7 @@ protected function createDoiContactRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1383,7 +1383,7 @@ protected function createFolderRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1658,7 +1658,7 @@ protected function createListRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1931,7 +1931,7 @@ protected function deleteAttributeRequest($attributeCategory, $attributeName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2199,7 +2199,7 @@ protected function deleteContactRequest($identifier, $identifierType = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2450,7 +2450,7 @@ protected function deleteFolderRequest($folderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2701,7 +2701,7 @@ protected function deleteListRequest($listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2990,7 +2990,7 @@ protected function deleteMultiAttributeOptionsRequest($attributeType, $multipleC
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3243,7 +3243,7 @@ protected function getAttributesRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3558,7 +3558,7 @@ protected function getContactInfoRequest($identifier, $identifierType = null, $s
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3864,7 +3864,7 @@ protected function getContactStatsRequest($identifier, $startDate = null, $endDa
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4208,7 +4208,7 @@ protected function getContactsRequest($limit = '50', $offset = '0', $modifiedSin
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4532,7 +4532,7 @@ protected function getContactsFromListRequest($listId, $modifiedSince = null, $l
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4820,7 +4820,7 @@ protected function getFolderRequest($folderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -5135,7 +5135,7 @@ protected function getFolderListsRequest($folderId, $limit = '10', $offset = '0'
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -5423,7 +5423,7 @@ protected function getFoldersRequest($limit = '10', $offset = '0', $sort = 'desc
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -5729,7 +5729,7 @@ protected function getListRequest($listId, $startDate = null, $endDate = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -6017,7 +6017,7 @@ protected function getListsRequest($limit = '10', $offset = '0', $sort = 'desc')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -6317,7 +6317,7 @@ protected function getSegmentsRequest($limit, $offset, $sort = 'desc')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -6589,7 +6589,7 @@ protected function importContactsRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -6891,7 +6891,7 @@ protected function removeContactFromListRequest($body, $listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -7174,7 +7174,7 @@ protected function requestContactExportRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -7458,7 +7458,7 @@ protected function updateAttributeRequest($body, $attributeCategory, $attributeN
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -7696,7 +7696,7 @@ protected function updateBatchContactsRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -7978,7 +7978,7 @@ protected function updateContactRequest($body, $identifier, $identifierType = nu
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -8243,7 +8243,7 @@ protected function updateFolderRequest($body, $folderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -8508,7 +8508,7 @@ protected function updateListRequest($body, $listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/ConversationsApi.php b/lib/Api/ConversationsApi.php
index 570d4c5..35c5073 100644
--- a/lib/Api/ConversationsApi.php
+++ b/lib/Api/ConversationsApi.php
@@ -70,9 +70,9 @@ class ConversationsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -248,7 +248,7 @@ protected function conversationsAgentOnlinePingPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -509,7 +509,7 @@ protected function conversationsMessagesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -804,7 +804,7 @@ protected function conversationsMessagesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1104,7 +1104,7 @@ protected function conversationsMessagesIdPutRequest($id, $body = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1386,7 +1386,7 @@ protected function conversationsMessagesPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1647,7 +1647,7 @@ protected function conversationsPushedMessagesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1942,7 +1942,7 @@ protected function conversationsPushedMessagesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2248,7 +2248,7 @@ protected function conversationsPushedMessagesIdPutRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -2530,7 +2530,7 @@ protected function conversationsPushedMessagesPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/CouponsApi.php b/lib/Api/CouponsApi.php
index ee2bde7..2e31178 100644
--- a/lib/Api/CouponsApi.php
+++ b/lib/Api/CouponsApi.php
@@ -70,9 +70,9 @@ class CouponsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -293,7 +293,7 @@ protected function createCouponCollectionRequest($createCouponCollection)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createCouponCollection)) {
             $_tempBody = $createCouponCollection;
@@ -554,7 +554,7 @@ protected function createCouponsRequest($createCoupons)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createCoupons)) {
             $_tempBody = $createCoupons;
@@ -860,7 +860,7 @@ protected function getCouponCollectionRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1182,7 +1182,7 @@ protected function getCouponCollectionsRequest($limit = '50', $offset = '0', $so
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1488,7 +1488,7 @@ protected function updateCouponCollectionRequest($id, $updateCouponCollection)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateCouponCollection)) {
             $_tempBody = $updateCouponCollection;
diff --git a/lib/Api/DealsApi.php b/lib/Api/DealsApi.php
index 1540c93..f7b6188 100644
--- a/lib/Api/DealsApi.php
+++ b/lib/Api/DealsApi.php
@@ -70,9 +70,9 @@ class DealsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -266,7 +266,7 @@ protected function crmAttributesDealsGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -597,7 +597,7 @@ protected function crmDealsGetRequest($filtersAttributesDealName = null, $filter
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -855,7 +855,7 @@ protected function crmDealsIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1150,7 +1150,7 @@ protected function crmDealsIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1419,7 +1419,7 @@ protected function crmDealsIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1683,7 +1683,7 @@ protected function crmDealsLinkUnlinkIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1957,7 +1957,7 @@ protected function crmDealsPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -2228,7 +2228,7 @@ protected function crmPipelineDetailsAllGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2488,7 +2488,7 @@ protected function crmPipelineDetailsGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2775,7 +2775,7 @@ protected function crmPipelineDetailsPipelineIDGetRequest($pipelineID)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/DomainsApi.php b/lib/Api/DomainsApi.php
index c4ec0d6..cafa2d3 100644
--- a/lib/Api/DomainsApi.php
+++ b/lib/Api/DomainsApi.php
@@ -70,9 +70,9 @@ class DomainsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -301,7 +301,7 @@ protected function authenticateDomainRequest($domainName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -574,7 +574,7 @@ protected function createDomainRequest($domainName = null)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($domainName)) {
             $_tempBody = $domainName;
@@ -835,7 +835,7 @@ protected function deleteDomainRequest($domainName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1130,7 +1130,7 @@ protected function getDomainConfigurationRequest($domainName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1398,7 +1398,7 @@ protected function getDomainsRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/EcommerceApi.php b/lib/Api/EcommerceApi.php
index d667474..c61628d 100644
--- a/lib/Api/EcommerceApi.php
+++ b/lib/Api/EcommerceApi.php
@@ -70,9 +70,9 @@ class EcommerceApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -248,7 +248,7 @@ protected function createBatchOrderRequest($orderBatch)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($orderBatch)) {
             $_tempBody = $orderBatch;
@@ -493,7 +493,7 @@ protected function createOrderRequest($order)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($order)) {
             $_tempBody = $order;
@@ -775,7 +775,7 @@ protected function createUpdateBatchCategoryRequest($createUpdateBatchCategory)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createUpdateBatchCategory)) {
             $_tempBody = $createUpdateBatchCategory;
@@ -1057,7 +1057,7 @@ protected function createUpdateBatchProductsRequest($createUpdateBatchProducts)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createUpdateBatchProducts)) {
             $_tempBody = $createUpdateBatchProducts;
@@ -1339,7 +1339,7 @@ protected function createUpdateCategoryRequest($createUpdateCategory)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createUpdateCategory)) {
             $_tempBody = $createUpdateCategory;
@@ -1621,7 +1621,7 @@ protected function createUpdateProductRequest($createUpdateProduct)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createUpdateProduct)) {
             $_tempBody = $createUpdateProduct;
@@ -1863,7 +1863,7 @@ protected function ecommerceActivatePostRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2201,7 +2201,7 @@ protected function getCategoriesRequest($limit = '50', $offset = '0', $sort = 'd
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2496,7 +2496,7 @@ protected function getCategoryInfoRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2813,7 +2813,7 @@ protected function getOrdersRequest($limit = '50', $offset = '0', $sort = 'desc'
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3108,7 +3108,7 @@ protected function getProductInfoRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3512,7 +3512,7 @@ protected function getProductsRequest($limit = '50', $offset = '0', $sort = 'des
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/EmailCampaignsApi.php b/lib/Api/EmailCampaignsApi.php
index dd6a29b..efa62c7 100644
--- a/lib/Api/EmailCampaignsApi.php
+++ b/lib/Api/EmailCampaignsApi.php
@@ -284,7 +284,7 @@ protected function createEmailCampaignRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -538,7 +538,7 @@ protected function deleteEmailCampaignRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -831,7 +831,7 @@ protected function emailExportRecipientsRequest($campaignId, $body = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1130,7 +1130,7 @@ protected function getAbTestCampaignResultRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1427,7 +1427,7 @@ protected function getEmailCampaignRequest($campaignId, $statistics = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1769,7 +1769,7 @@ protected function getEmailCampaignsRequest($type = null, $status = null, $stati
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2057,7 +2057,7 @@ protected function getSharedTemplateUrlRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2316,7 +2316,7 @@ protected function sendEmailCampaignNowRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2578,7 +2578,7 @@ protected function sendReportRequest($body, $campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -2843,7 +2843,7 @@ protected function sendTestEmailRequest($body, $campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -3108,7 +3108,7 @@ protected function updateCampaignStatusRequest($body, $campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -3373,7 +3373,7 @@ protected function updateEmailCampaignRequest($body, $campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -3648,7 +3648,7 @@ protected function uploadImageToGalleryRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/EventsApi.php b/lib/Api/EventsApi.php
index 88a81c4..df4d74e 100644
--- a/lib/Api/EventsApi.php
+++ b/lib/Api/EventsApi.php
@@ -70,9 +70,9 @@ class EventsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -256,7 +256,7 @@ protected function createEventRequest($event)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($event)) {
             $_tempBody = $event;
diff --git a/lib/Api/ExternalFeedsApi.php b/lib/Api/ExternalFeedsApi.php
index 3970d76..2c35388 100644
--- a/lib/Api/ExternalFeedsApi.php
+++ b/lib/Api/ExternalFeedsApi.php
@@ -70,9 +70,9 @@ class ExternalFeedsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function createExternalFeedRequest($createExternalFeed)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createExternalFeed)) {
             $_tempBody = $createExternalFeed;
@@ -546,7 +546,7 @@ protected function deleteExternalFeedRequest($uuid)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -892,7 +892,7 @@ protected function getAllExternalFeedsRequest($search = null, $startDate = null,
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1187,7 +1187,7 @@ protected function getExternalFeedByUUIDRequest($uuid)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1456,7 +1456,7 @@ protected function updateExternalFeedRequest($uuid, $updateExternalFeed)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateExternalFeed)) {
             $_tempBody = $updateExternalFeed;
diff --git a/lib/Api/FilesApi.php b/lib/Api/FilesApi.php
index ee1f190..8748d6a 100644
--- a/lib/Api/FilesApi.php
+++ b/lib/Api/FilesApi.php
@@ -70,9 +70,9 @@ class FilesApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -337,7 +337,7 @@ protected function crmFilesGetRequest($entity = null, $entityIds = null, $dateFr
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -632,7 +632,7 @@ protected function crmFilesIdDataGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -890,7 +890,7 @@ protected function crmFilesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1185,7 +1185,7 @@ protected function crmFilesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1496,7 +1496,7 @@ protected function crmFilesPostRequest($file, $dealId = null, $contactId = null,
         if ($companyId !== null) {
             $formParams['companyId'] = ObjectSerializer::toFormValue($companyId);
         }
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/FoldersApi.php b/lib/Api/FoldersApi.php
index 80d50fb..a494662 100644
--- a/lib/Api/FoldersApi.php
+++ b/lib/Api/FoldersApi.php
@@ -70,9 +70,9 @@ class FoldersApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function createFolderRequest($createFolder)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createFolder)) {
             $_tempBody = $createFolder;
@@ -546,7 +546,7 @@ protected function deleteFolderRequest($folderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -841,7 +841,7 @@ protected function getFolderRequest($folderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1167,7 +1167,7 @@ protected function getFolderListsRequest($folderId, $limit = '10', $offset = '0'
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1478,7 +1478,7 @@ protected function getFoldersRequest($limit, $offset, $sort = 'desc')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1747,7 +1747,7 @@ protected function updateFolderRequest($folderId, $updateFolder)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateFolder)) {
             $_tempBody = $updateFolder;
diff --git a/lib/Api/InboundParsingApi.php b/lib/Api/InboundParsingApi.php
index 865dd15..673e58e 100644
--- a/lib/Api/InboundParsingApi.php
+++ b/lib/Api/InboundParsingApi.php
@@ -70,9 +70,9 @@ class InboundParsingApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -301,7 +301,7 @@ protected function getInboundEmailAttachmentRequest($downloadToken)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -630,7 +630,7 @@ protected function getInboundEmailEventsRequest($sender = null, $startDate = nul
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -917,7 +917,7 @@ protected function getInboundEmailEventsByUuidRequest($uuid)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/ListsApi.php b/lib/Api/ListsApi.php
index da332bd..1024d34 100644
--- a/lib/Api/ListsApi.php
+++ b/lib/Api/ListsApi.php
@@ -70,9 +70,9 @@ class ListsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -312,7 +312,7 @@ protected function addContactToListRequest($listId, $contactEmails)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($contactEmails)) {
             $_tempBody = $contactEmails;
@@ -594,7 +594,7 @@ protected function createListRequest($createList)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createList)) {
             $_tempBody = $createList;
@@ -855,7 +855,7 @@ protected function deleteListRequest($listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1190,7 +1190,7 @@ protected function getContactsFromListRequest($listId, $modifiedSince = null, $l
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1516,7 +1516,7 @@ protected function getFolderListsRequest($folderId, $limit = '10', $offset = '0'
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1811,7 +1811,7 @@ protected function getListRequest($listId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2110,7 +2110,7 @@ protected function getListsRequest($limit = '10', $offset = '0', $sort = 'desc')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2416,7 +2416,7 @@ protected function removeContactFromListRequest($listId, $contactEmails)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($contactEmails)) {
             $_tempBody = $contactEmails;
@@ -2688,7 +2688,7 @@ protected function updateListRequest($listId, $updateList)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateList)) {
             $_tempBody = $updateList;
diff --git a/lib/Api/MasterAccountApi.php b/lib/Api/MasterAccountApi.php
index 8de81eb..f0365e1 100644
--- a/lib/Api/MasterAccountApi.php
+++ b/lib/Api/MasterAccountApi.php
@@ -70,9 +70,9 @@ class MasterAccountApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -267,7 +267,7 @@ protected function corporateGroupIdPutRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -549,7 +549,7 @@ protected function corporateGroupPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -820,7 +820,7 @@ protected function corporateMasterAccountGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1118,7 +1118,7 @@ protected function corporateSubAccountGetRequest($offset, $limit)
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1387,7 +1387,7 @@ protected function corporateSubAccountIdApplicationsTogglePutRequest($id, $toggl
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($toggleApplications)) {
             $_tempBody = $toggleApplications;
@@ -1632,7 +1632,7 @@ protected function corporateSubAccountIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1911,7 +1911,7 @@ protected function corporateSubAccountIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2180,7 +2180,7 @@ protected function corporateSubAccountIdPlanPutRequest($id, $updatePlanDetails)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updatePlanDetails)) {
             $_tempBody = $updatePlanDetails;
@@ -2462,7 +2462,7 @@ protected function corporateSubAccountKeyPostRequest($createApiKeyRequest)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createApiKeyRequest)) {
             $_tempBody = $createApiKeyRequest;
@@ -2744,7 +2744,7 @@ protected function corporateSubAccountPostRequest($subAccountCreate)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($subAccountCreate)) {
             $_tempBody = $subAccountCreate;
@@ -3034,7 +3034,7 @@ protected function corporateSubAccountSsoTokenPostRequest($ssoTokenRequest)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($ssoTokenRequest)) {
             $_tempBody = $ssoTokenRequest;
@@ -3287,7 +3287,7 @@ protected function corporateUserRevokeEmailDeleteRequest($email)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3598,7 +3598,7 @@ protected function getAccountActivityRequest($startDate = null, $endDate = null,
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3866,7 +3866,7 @@ protected function getCorporateInvitedUsersListRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4134,7 +4134,7 @@ protected function getSubAccountGroupsRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4413,7 +4413,7 @@ protected function inviteAdminUserRequest($sendInvitation)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendInvitation)) {
             $_tempBody = $sendInvitation;
diff --git a/lib/Api/NotesApi.php b/lib/Api/NotesApi.php
index 16e235d..9dec3b7 100644
--- a/lib/Api/NotesApi.php
+++ b/lib/Api/NotesApi.php
@@ -70,9 +70,9 @@ class NotesApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -337,7 +337,7 @@ protected function crmNotesGetRequest($entity = null, $entityIds = null, $dateFr
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -595,7 +595,7 @@ protected function crmNotesIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -890,7 +890,7 @@ protected function crmNotesIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1167,7 +1167,7 @@ protected function crmNotesIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1457,7 +1457,7 @@ protected function crmNotesPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/ProcessApi.php b/lib/Api/ProcessApi.php
index 7e38628..3b5b5de 100644
--- a/lib/Api/ProcessApi.php
+++ b/lib/Api/ProcessApi.php
@@ -70,9 +70,9 @@ class ProcessApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -301,7 +301,7 @@ protected function getProcessRequest($processId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -603,7 +603,7 @@ protected function getProcessesRequest($limit = '10', $offset = '0', $sort = 'de
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/ResellerApi.php b/lib/Api/ResellerApi.php
index 410a8c5..429f062 100644
--- a/lib/Api/ResellerApi.php
+++ b/lib/Api/ResellerApi.php
@@ -70,9 +70,9 @@ class ResellerApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -320,7 +320,7 @@ protected function addCreditsRequest($childIdentifier, $addCredits)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($addCredits)) {
             $_tempBody = $addCredits;
@@ -592,7 +592,7 @@ protected function associateIpToChildRequest($childIdentifier, $ip)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($ip)) {
             $_tempBody = $ip;
@@ -872,7 +872,7 @@ protected function createChildDomainRequest($childIdentifier, $addChildDomain)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($addChildDomain)) {
             $_tempBody = $addChildDomain;
@@ -1156,7 +1156,7 @@ protected function createResellerChildRequest($resellerChild = null)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($resellerChild)) {
             $_tempBody = $resellerChild;
@@ -1444,7 +1444,7 @@ protected function deleteChildDomainRequest($childIdentifier, $domainName)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1710,7 +1710,7 @@ protected function deleteResellerChildRequest($childIdentifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1979,7 +1979,7 @@ protected function dissociateIpFromChildRequest($childIdentifier, $ip)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($ip)) {
             $_tempBody = $ip;
@@ -2285,7 +2285,7 @@ protected function getChildAccountCreationStatusRequest($childIdentifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2588,7 +2588,7 @@ protected function getChildDomainsRequest($childIdentifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2891,7 +2891,7 @@ protected function getChildInfoRequest($childIdentifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3184,7 +3184,7 @@ protected function getResellerChildsRequest($limit = '10', $offset = '0')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3487,7 +3487,7 @@ protected function getSsoTokenRequest($childIdentifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3801,7 +3801,7 @@ protected function removeCreditsRequest($childIdentifier, $removeCredits)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($removeCredits)) {
             $_tempBody = $removeCredits;
@@ -4081,7 +4081,7 @@ protected function updateChildAccountStatusRequest($childIdentifier, $updateChil
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateChildAccountStatus)) {
             $_tempBody = $updateChildAccountStatus;
@@ -4380,7 +4380,7 @@ protected function updateChildDomainRequest($childIdentifier, $domainName, $upda
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateChildDomain)) {
             $_tempBody = $updateChildDomain;
@@ -4660,7 +4660,7 @@ protected function updateResellerChildRequest($childIdentifier, $resellerChild)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($resellerChild)) {
             $_tempBody = $resellerChild;
diff --git a/lib/Api/SMSCampaignsApi.php b/lib/Api/SMSCampaignsApi.php
index f01c678..affd6bc 100644
--- a/lib/Api/SMSCampaignsApi.php
+++ b/lib/Api/SMSCampaignsApi.php
@@ -70,9 +70,9 @@ class SMSCampaignsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function createSmsCampaignRequest($createSmsCampaign)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createSmsCampaign)) {
             $_tempBody = $createSmsCampaign;
@@ -546,7 +546,7 @@ protected function deleteSmsCampaignRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -841,7 +841,7 @@ protected function getSmsCampaignRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1170,7 +1170,7 @@ protected function getSmsCampaignsRequest($status = null, $startDate = null, $en
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1470,7 +1470,7 @@ protected function requestSmsRecipientExportRequest($campaignId, $recipientExpor
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($recipientExport)) {
             $_tempBody = $recipientExport;
@@ -1739,7 +1739,7 @@ protected function sendSmsCampaignNowRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2008,7 +2008,7 @@ protected function sendSmsReportRequest($campaignId, $sendReport)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendReport)) {
             $_tempBody = $sendReport;
@@ -2280,7 +2280,7 @@ protected function sendTestSmsRequest($campaignId, $phoneNumber)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($phoneNumber)) {
             $_tempBody = $phoneNumber;
@@ -2552,7 +2552,7 @@ protected function updateSmsCampaignRequest($campaignId, $updateSmsCampaign)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateSmsCampaign)) {
             $_tempBody = $updateSmsCampaign;
@@ -2824,7 +2824,7 @@ protected function updateSmsCampaignStatusRequest($campaignId, $status)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($status)) {
             $_tempBody = $status;
diff --git a/lib/Api/SendersApi.php b/lib/Api/SendersApi.php
index 8da7a97..0998222 100644
--- a/lib/Api/SendersApi.php
+++ b/lib/Api/SendersApi.php
@@ -70,9 +70,9 @@ class SendersApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -279,7 +279,7 @@ protected function createSenderRequest($sender = null)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sender)) {
             $_tempBody = $sender;
@@ -540,7 +540,7 @@ protected function deleteSenderRequest($senderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -800,7 +800,7 @@ protected function getIpsRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1095,7 +1095,7 @@ protected function getIpsFromSenderRequest($senderId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1381,7 +1381,7 @@ protected function getSendersRequest($ip = null, $domain = null)
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1644,7 +1644,7 @@ protected function updateSenderRequest($senderId, $sender = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sender)) {
             $_tempBody = $sender;
@@ -1910,7 +1910,7 @@ protected function validateSenderByOTPRequest($senderId, $otp = null)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($otp)) {
             $_tempBody = $otp;
diff --git a/lib/Api/TasksApi.php b/lib/Api/TasksApi.php
index 259ce0f..01defba 100644
--- a/lib/Api/TasksApi.php
+++ b/lib/Api/TasksApi.php
@@ -70,9 +70,9 @@ class TasksApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -391,7 +391,7 @@ protected function crmTasksGetRequest($filterType = null, $filterStatus = null,
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -649,7 +649,7 @@ protected function crmTasksIdDeleteRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -944,7 +944,7 @@ protected function crmTasksIdGetRequest($id)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1213,7 +1213,7 @@ protected function crmTasksIdPatchRequest($id, $body)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1487,7 +1487,7 @@ protected function crmTasksPostRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
@@ -1750,7 +1750,7 @@ protected function crmTasktypesGetRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/TransactionalEmailsApi.php b/lib/Api/TransactionalEmailsApi.php
index ad43e99..1d83cdf 100644
--- a/lib/Api/TransactionalEmailsApi.php
+++ b/lib/Api/TransactionalEmailsApi.php
@@ -248,7 +248,7 @@ protected function blockNewDomainRequest($blockDomain)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($blockDomain)) {
             $_tempBody = $blockDomain;
@@ -530,7 +530,7 @@ protected function createSmtpTemplateRequest($smtpTemplate)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($smtpTemplate)) {
             $_tempBody = $smtpTemplate;
@@ -783,7 +783,7 @@ protected function deleteBlockedDomainRequest($domain)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1019,7 +1019,7 @@ protected function deleteHardbouncesRequest($deleteHardbounces = null)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($deleteHardbounces)) {
             $_tempBody = $deleteHardbounces;
@@ -1280,7 +1280,7 @@ protected function deleteScheduledEmailByIdRequest($identifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1538,7 +1538,7 @@ protected function deleteSmtpTemplateRequest($templateId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1842,7 +1842,7 @@ protected function getAggregatedSmtpReportRequest($startDate = null, $endDate =
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2102,7 +2102,7 @@ protected function getBlockedDomainsRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2476,7 +2476,7 @@ protected function getEmailEventReportRequest($limit = '2500', $offset = '0', $s
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2832,7 +2832,7 @@ protected function getScheduledEmailByBatchIdRequest($batchId, $startDate = null
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3145,7 +3145,7 @@ protected function getScheduledEmailByMessageIdRequest($messageId, $startDate =
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3483,7 +3483,7 @@ protected function getSmtpReportRequest($limit = '10', $offset = '0', $startDate
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -3778,7 +3778,7 @@ protected function getSmtpTemplateRequest($templateId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4089,7 +4089,7 @@ protected function getSmtpTemplatesRequest($templateStatus = null, $limit = '50'
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4421,7 +4421,7 @@ protected function getTransacBlockedContactsRequest($startDate = null, $endDate
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -4700,7 +4700,7 @@ protected function getTransacEmailContentRequest($uuid)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -5047,7 +5047,7 @@ protected function getTransacEmailsListRequest($email = null, $templateId = null
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -5316,7 +5316,7 @@ protected function sendTestTemplateRequest($templateId, $sendTestEmail)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendTestEmail)) {
             $_tempBody = $sendTestEmail;
@@ -5606,7 +5606,7 @@ protected function sendTransacEmailRequest($sendSmtpEmail)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendSmtpEmail)) {
             $_tempBody = $sendSmtpEmail;
@@ -5867,7 +5867,7 @@ protected function smtpBlockedContactsEmailDeleteRequest($email)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -6125,7 +6125,7 @@ protected function smtpLogIdentifierDeleteRequest($identifier)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -6394,7 +6394,7 @@ protected function updateSmtpTemplateRequest($templateId, $smtpTemplate)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($smtpTemplate)) {
             $_tempBody = $smtpTemplate;
diff --git a/lib/Api/TransactionalSMSApi.php b/lib/Api/TransactionalSMSApi.php
index 669db59..c40f2c7 100644
--- a/lib/Api/TransactionalSMSApi.php
+++ b/lib/Api/TransactionalSMSApi.php
@@ -69,9 +69,9 @@ class TransactionalSMSApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -354,7 +354,7 @@ protected function getSmsEventsRequest($limit = '50', $startDate = null, $endDat
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -651,7 +651,7 @@ protected function getTransacAggregatedSmsReportRequest($startDate = null, $endD
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -957,7 +957,7 @@ protected function getTransacSmsReportRequest($startDate = null, $endDate = null
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1173,7 +1173,7 @@ protected function sendAsyncTransactionalSmsRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1453,7 +1453,7 @@ protected function sendTransacSmsRequest($body)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($body)) {
             $_tempBody = $body;
diff --git a/lib/Api/TransactionalWhatsAppApi.php b/lib/Api/TransactionalWhatsAppApi.php
index 3bec4c2..74ffa25 100644
--- a/lib/Api/TransactionalWhatsAppApi.php
+++ b/lib/Api/TransactionalWhatsAppApi.php
@@ -70,9 +70,9 @@ class TransactionalWhatsAppApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -353,7 +353,7 @@ protected function getWhatsappEventReportRequest($limit = '2500', $offset = '0',
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -632,7 +632,7 @@ protected function sendWhatsappMessageRequest($sendWhatsappMessage)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendWhatsappMessage)) {
             $_tempBody = $sendWhatsappMessage;
diff --git a/lib/Api/UserApi.php b/lib/Api/UserApi.php
index 34298d7..d949d10 100644
--- a/lib/Api/UserApi.php
+++ b/lib/Api/UserApi.php
@@ -70,9 +70,9 @@ class UserApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function editUserPermissionRequest($updatePermissions)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updatePermissions)) {
             $_tempBody = $updatePermissions;
@@ -556,7 +556,7 @@ protected function getInvitedUsersListRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -843,7 +843,7 @@ protected function getUserPermissionRequest($email)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1122,7 +1122,7 @@ protected function inviteuserRequest($sendInvitation)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($sendInvitation)) {
             $_tempBody = $sendInvitation;
@@ -1412,7 +1412,7 @@ protected function putRevokeUserPermissionRequest($email)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1718,7 +1718,7 @@ protected function putresendcancelinvitationRequest($action, $email)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
diff --git a/lib/Api/WebhooksApi.php b/lib/Api/WebhooksApi.php
index 67c6096..e6b5d6f 100644
--- a/lib/Api/WebhooksApi.php
+++ b/lib/Api/WebhooksApi.php
@@ -70,9 +70,9 @@ class WebhooksApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function createWebhookRequest($createWebhook)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($createWebhook)) {
             $_tempBody = $createWebhook;
@@ -546,7 +546,7 @@ protected function deleteWebhookRequest($webhookId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -825,7 +825,7 @@ protected function exportWebhooksHistoryRequest($exportWebhookHistory)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($exportWebhookHistory)) {
             $_tempBody = $exportWebhookHistory;
@@ -1123,7 +1123,7 @@ protected function getWebhookRequest($webhookId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1409,7 +1409,7 @@ protected function getWebhooksRequest($type = 'transactional', $sort = 'desc')
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1678,7 +1678,7 @@ protected function updateWebhookRequest($webhookId, $updateWebhook)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($updateWebhook)) {
             $_tempBody = $updateWebhook;
diff --git a/lib/Api/WhatsAppCampaignsApi.php b/lib/Api/WhatsAppCampaignsApi.php
index e6430a0..d4f3df9 100644
--- a/lib/Api/WhatsAppCampaignsApi.php
+++ b/lib/Api/WhatsAppCampaignsApi.php
@@ -70,9 +70,9 @@ class WhatsAppCampaignsApi
      * @param HeaderSelector  $selector
      */
     public function __construct(
-        ClientInterface $client = null,
-        Configuration $config = null,
-        HeaderSelector $selector = null
+        ?ClientInterface $client = null,
+        ?Configuration $config = null,
+        ?HeaderSelector $selector = null
     ) {
         $this->client = $client ?: new Client();
         $this->config = $config ?: new Configuration();
@@ -285,7 +285,7 @@ protected function createWhatsAppCampaignRequest($whatsAppCampaigns)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($whatsAppCampaigns)) {
             $_tempBody = $whatsAppCampaigns;
@@ -567,7 +567,7 @@ protected function createWhatsAppTemplateRequest($whatsAppTemplates)
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($whatsAppTemplates)) {
             $_tempBody = $whatsAppTemplates;
@@ -828,7 +828,7 @@ protected function deleteWhatsAppCampaignRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1123,7 +1123,7 @@ protected function getWhatsAppCampaignRequest($campaignId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1443,7 +1443,7 @@ protected function getWhatsAppCampaignsRequest($startDate = null, $endDate = nul
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -1711,7 +1711,7 @@ protected function getWhatsAppConfigRequest()
 
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2040,7 +2040,7 @@ protected function getWhatsAppTemplatesRequest($startDate = null, $endDate = nul
         }
 
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2290,7 +2290,7 @@ protected function sendWhatsAppTemplateApprovalRequest($templateId)
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
 
         if ($multipart) {
@@ -2553,7 +2553,7 @@ protected function updateWhatsAppCampaignRequest($campaignId, $whatsAppCampaign
             );
         }
 
-        // body params
+        // body ?params
         $_tempBody = null;
         if (isset($whatsAppCampaign)) {
             $_tempBody = $whatsAppCampaign;
diff --git a/lib/Model/AbTestCampaignResult.php b/lib/Model/AbTestCampaignResult.php
index b9695a3..9ccd337 100644
--- a/lib/Model/AbTestCampaignResult.php
+++ b/lib/Model/AbTestCampaignResult.php
@@ -246,7 +246,7 @@ public function getWinningCriteriaAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['winningVersion'] = isset($data['winningVersion']) ? $data['winningVersion'] : null;
         $this->container['winningCriteria'] = isset($data['winningCriteria']) ? $data['winningCriteria'] : null;
diff --git a/lib/Model/AbTestCampaignResultClickedLinks.php b/lib/Model/AbTestCampaignResultClickedLinks.php
index 55733e5..1037bbc 100644
--- a/lib/Model/AbTestCampaignResultClickedLinks.php
+++ b/lib/Model/AbTestCampaignResultClickedLinks.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['versionA'] = isset($data['versionA']) ? $data['versionA'] : null;
         $this->container['versionB'] = isset($data['versionB']) ? $data['versionB'] : null;
diff --git a/lib/Model/AbTestCampaignResultStatistics.php b/lib/Model/AbTestCampaignResultStatistics.php
index e705a7f..c5507ab 100644
--- a/lib/Model/AbTestCampaignResultStatistics.php
+++ b/lib/Model/AbTestCampaignResultStatistics.php
@@ -200,7 +200,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['openers'] = isset($data['openers']) ? $data['openers'] : null;
         $this->container['clicks'] = isset($data['clicks']) ? $data['clicks'] : null;
diff --git a/lib/Model/AbTestVersionClicks.php b/lib/Model/AbTestVersionClicks.php
index 451cb82..bd315cb 100644
--- a/lib/Model/AbTestVersionClicks.php
+++ b/lib/Model/AbTestVersionClicks.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/AbTestVersionClicksInner.php b/lib/Model/AbTestVersionClicksInner.php
index f1ef63d..6b14fca 100644
--- a/lib/Model/AbTestVersionClicksInner.php
+++ b/lib/Model/AbTestVersionClicksInner.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['link'] = isset($data['link']) ? $data['link'] : null;
         $this->container['clicksCount'] = isset($data['clicksCount']) ? $data['clicksCount'] : null;
diff --git a/lib/Model/AbTestVersionStats.php b/lib/Model/AbTestVersionStats.php
index 7e93076..f9850dd 100644
--- a/lib/Model/AbTestVersionStats.php
+++ b/lib/Model/AbTestVersionStats.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['versionA'] = isset($data['versionA']) ? $data['versionA'] : null;
         $this->container['versionB'] = isset($data['versionB']) ? $data['versionB'] : null;
diff --git a/lib/Model/AddChildDomain.php b/lib/Model/AddChildDomain.php
index a47f8cf..6b71b6f 100644
--- a/lib/Model/AddChildDomain.php
+++ b/lib/Model/AddChildDomain.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
     }
diff --git a/lib/Model/AddContactToList.php b/lib/Model/AddContactToList.php
index 5f52693..1d254bb 100644
--- a/lib/Model/AddContactToList.php
+++ b/lib/Model/AddContactToList.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['emails'] = isset($data['emails']) ? $data['emails'] : null;
         $this->container['ids'] = isset($data['ids']) ? $data['ids'] : null;
diff --git a/lib/Model/AddCredits.php b/lib/Model/AddCredits.php
index 6144e98..e036d7f 100644
--- a/lib/Model/AddCredits.php
+++ b/lib/Model/AddCredits.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sms'] = isset($data['sms']) ? $data['sms'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/AllOfgetContactsContactsItems.php b/lib/Model/AllOfgetContactsContactsItems.php
index 584ee52..f2863eb 100644
--- a/lib/Model/AllOfgetContactsContactsItems.php
+++ b/lib/Model/AllOfgetContactsContactsItems.php
@@ -159,7 +159,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/AllOfgetEmailCampaignsCampaignsItems.php b/lib/Model/AllOfgetEmailCampaignsCampaignsItems.php
index 3585a5a..e4710fb 100644
--- a/lib/Model/AllOfgetEmailCampaignsCampaignsItems.php
+++ b/lib/Model/AllOfgetEmailCampaignsCampaignsItems.php
@@ -174,7 +174,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/AuthenticateDomainModel.php b/lib/Model/AuthenticateDomainModel.php
index ad14e3e..ab66c9d 100644
--- a/lib/Model/AuthenticateDomainModel.php
+++ b/lib/Model/AuthenticateDomainModel.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domainName'] = isset($data['domainName']) ? $data['domainName'] : null;
         $this->container['message'] = isset($data['message']) ? $data['message'] : null;
diff --git a/lib/Model/BlockDomain.php b/lib/Model/BlockDomain.php
index 427488f..fd6b876 100644
--- a/lib/Model/BlockDomain.php
+++ b/lib/Model/BlockDomain.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
     }
diff --git a/lib/Model/Body.php b/lib/Model/Body.php
index 0ad0717..598313b 100644
--- a/lib/Model/Body.php
+++ b/lib/Model/Body.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['groupName'] = isset($data['groupName']) ? $data['groupName'] : null;
         $this->container['subAccountIds'] = isset($data['subAccountIds']) ? $data['subAccountIds'] : null;
diff --git a/lib/Model/Body1.php b/lib/Model/Body1.php
index b1a9608..e61963b 100644
--- a/lib/Model/Body1.php
+++ b/lib/Model/Body1.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['groupName'] = isset($data['groupName']) ? $data['groupName'] : null;
         $this->container['subAccountIds'] = isset($data['subAccountIds']) ? $data['subAccountIds'] : null;
diff --git a/lib/Model/Body10.php b/lib/Model/Body10.php
index 2e0f62f..b7d5d85 100644
--- a/lib/Model/Body10.php
+++ b/lib/Model/Body10.php
@@ -200,7 +200,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['visitorId'] = isset($data['visitorId']) ? $data['visitorId'] : null;
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
diff --git a/lib/Model/Body11.php b/lib/Model/Body11.php
index 0899cd0..0caace5 100644
--- a/lib/Model/Body11.php
+++ b/lib/Model/Body11.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
     }
diff --git a/lib/Model/Body12.php b/lib/Model/Body12.php
index 8905dbf..91453a3 100644
--- a/lib/Model/Body12.php
+++ b/lib/Model/Body12.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['visitorId'] = isset($data['visitorId']) ? $data['visitorId'] : null;
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
diff --git a/lib/Model/Body13.php b/lib/Model/Body13.php
index 7a8f8d4..4d860f6 100644
--- a/lib/Model/Body13.php
+++ b/lib/Model/Body13.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
     }
diff --git a/lib/Model/Body14.php b/lib/Model/Body14.php
index 9ec924d..3edb000 100644
--- a/lib/Model/Body14.php
+++ b/lib/Model/Body14.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['agentId'] = isset($data['agentId']) ? $data['agentId'] : null;
         $this->container['receivedFrom'] = isset($data['receivedFrom']) ? $data['receivedFrom'] : null;
diff --git a/lib/Model/Body2.php b/lib/Model/Body2.php
index f65c38f..1e21b93 100644
--- a/lib/Model/Body2.php
+++ b/lib/Model/Body2.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/Body3.php b/lib/Model/Body3.php
index fc74d91..4c08478 100644
--- a/lib/Model/Body3.php
+++ b/lib/Model/Body3.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/Body4.php b/lib/Model/Body4.php
index 70e5320..0158751 100644
--- a/lib/Model/Body4.php
+++ b/lib/Model/Body4.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['linkContactIds'] = isset($data['linkContactIds']) ? $data['linkContactIds'] : null;
         $this->container['unlinkContactIds'] = isset($data['unlinkContactIds']) ? $data['unlinkContactIds'] : null;
diff --git a/lib/Model/Body5.php b/lib/Model/Body5.php
index d87bba6..fe7953e 100644
--- a/lib/Model/Body5.php
+++ b/lib/Model/Body5.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/Body6.php b/lib/Model/Body6.php
index 4175c72..423e1b9 100644
--- a/lib/Model/Body6.php
+++ b/lib/Model/Body6.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/Body7.php b/lib/Model/Body7.php
index 30616fc..cc7d0c6 100644
--- a/lib/Model/Body7.php
+++ b/lib/Model/Body7.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['linkContactIds'] = isset($data['linkContactIds']) ? $data['linkContactIds'] : null;
         $this->container['unlinkContactIds'] = isset($data['unlinkContactIds']) ? $data['unlinkContactIds'] : null;
diff --git a/lib/Model/Body8.php b/lib/Model/Body8.php
index c4abdf7..c6edf49 100644
--- a/lib/Model/Body8.php
+++ b/lib/Model/Body8.php
@@ -225,7 +225,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['duration'] = isset($data['duration']) ? $data['duration'] : null;
diff --git a/lib/Model/Body9.php b/lib/Model/Body9.php
index 6f12e43..a7001d1 100644
--- a/lib/Model/Body9.php
+++ b/lib/Model/Body9.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['duration'] = isset($data['duration']) ? $data['duration'] : null;
diff --git a/lib/Model/BodyVariablesItems.php b/lib/Model/BodyVariablesItems.php
index f5fa31c..0b5fa95 100644
--- a/lib/Model/BodyVariablesItems.php
+++ b/lib/Model/BodyVariablesItems.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/CompaniesList.php b/lib/Model/CompaniesList.php
index f263577..be77f42 100644
--- a/lib/Model/CompaniesList.php
+++ b/lib/Model/CompaniesList.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['items'] = isset($data['items']) ? $data['items'] : null;
     }
diff --git a/lib/Model/Company.php b/lib/Model/Company.php
index f0a5b0c..8e75a29 100644
--- a/lib/Model/Company.php
+++ b/lib/Model/Company.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/CompanyAttributes.php b/lib/Model/CompanyAttributes.php
index 1ba5907..d56c403 100644
--- a/lib/Model/CompanyAttributes.php
+++ b/lib/Model/CompanyAttributes.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/CompanyAttributesInner.php b/lib/Model/CompanyAttributesInner.php
index c41cc8a..c527dcd 100644
--- a/lib/Model/CompanyAttributesInner.php
+++ b/lib/Model/CompanyAttributesInner.php
@@ -196,7 +196,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['internalName'] = isset($data['internalName']) ? $data['internalName'] : null;
         $this->container['label'] = isset($data['label']) ? $data['label'] : null;
diff --git a/lib/Model/ComponentItems.php b/lib/Model/ComponentItems.php
index 69d5d34..2476093 100644
--- a/lib/Model/ComponentItems.php
+++ b/lib/Model/ComponentItems.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
diff --git a/lib/Model/Contact.php b/lib/Model/Contact.php
index a000b88..5633182 100644
--- a/lib/Model/Contact.php
+++ b/lib/Model/Contact.php
@@ -211,7 +211,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['virtualNextTask'] = isset($data['virtualNextTask']) ? $data['virtualNextTask'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/ContactErrorModel.php b/lib/Model/ContactErrorModel.php
index b3eb030..2d9dd47 100644
--- a/lib/Model/ContactErrorModel.php
+++ b/lib/Model/ContactErrorModel.php
@@ -206,7 +206,7 @@ public function getCodeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['code'] = isset($data['code']) ? $data['code'] : null;
         $this->container['message'] = isset($data['message']) ? $data['message'] : null;
diff --git a/lib/Model/ConversationsMessage.php b/lib/Model/ConversationsMessage.php
index b1eb84a..f7300f5 100644
--- a/lib/Model/ConversationsMessage.php
+++ b/lib/Model/ConversationsMessage.php
@@ -236,7 +236,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
diff --git a/lib/Model/ConversationsMessageFile.php b/lib/Model/ConversationsMessageFile.php
index ef207ef..fe05c15 100644
--- a/lib/Model/ConversationsMessageFile.php
+++ b/lib/Model/ConversationsMessageFile.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['filename'] = isset($data['filename']) ? $data['filename'] : null;
         $this->container['size'] = isset($data['size']) ? $data['size'] : null;
diff --git a/lib/Model/ConversationsMessageFileImageInfo.php b/lib/Model/ConversationsMessageFileImageInfo.php
index 2415cb4..3947e6a 100644
--- a/lib/Model/ConversationsMessageFileImageInfo.php
+++ b/lib/Model/ConversationsMessageFileImageInfo.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['width'] = isset($data['width']) ? $data['width'] : null;
         $this->container['height'] = isset($data['height']) ? $data['height'] : null;
diff --git a/lib/Model/CreateApiKeyRequest.php b/lib/Model/CreateApiKeyRequest.php
index 79f8147..f9337b0 100644
--- a/lib/Model/CreateApiKeyRequest.php
+++ b/lib/Model/CreateApiKeyRequest.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/CreateApiKeyResponse.php b/lib/Model/CreateApiKeyResponse.php
index 828b444..1ea5417 100644
--- a/lib/Model/CreateApiKeyResponse.php
+++ b/lib/Model/CreateApiKeyResponse.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['status'] = isset($data['status']) ? $data['status'] : null;
         $this->container['key'] = isset($data['key']) ? $data['key'] : null;
diff --git a/lib/Model/CreateAttribute.php b/lib/Model/CreateAttribute.php
index a66178a..1941c25 100644
--- a/lib/Model/CreateAttribute.php
+++ b/lib/Model/CreateAttribute.php
@@ -220,7 +220,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['isRecurring'] = isset($data['isRecurring']) ? $data['isRecurring'] : null;
diff --git a/lib/Model/CreateAttributeEnumeration.php b/lib/Model/CreateAttributeEnumeration.php
index b9da3d2..0d89947 100644
--- a/lib/Model/CreateAttributeEnumeration.php
+++ b/lib/Model/CreateAttributeEnumeration.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['label'] = isset($data['label']) ? $data['label'] : null;
diff --git a/lib/Model/CreateCategoryModel.php b/lib/Model/CreateCategoryModel.php
index 10995f6..c8de252 100644
--- a/lib/Model/CreateCategoryModel.php
+++ b/lib/Model/CreateCategoryModel.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/CreateChild.php b/lib/Model/CreateChild.php
index ceba8b6..5a34946 100644
--- a/lib/Model/CreateChild.php
+++ b/lib/Model/CreateChild.php
@@ -223,7 +223,7 @@ public function getLanguageAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['firstName'] = isset($data['firstName']) ? $data['firstName'] : null;
diff --git a/lib/Model/CreateContact.php b/lib/Model/CreateContact.php
index 00080da..b9078ac 100644
--- a/lib/Model/CreateContact.php
+++ b/lib/Model/CreateContact.php
@@ -207,7 +207,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['extId'] = isset($data['extId']) ? $data['extId'] : null;
diff --git a/lib/Model/CreateCouponCollection.php b/lib/Model/CreateCouponCollection.php
index d489d57..296db39 100644
--- a/lib/Model/CreateCouponCollection.php
+++ b/lib/Model/CreateCouponCollection.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['defaultCoupon'] = isset($data['defaultCoupon']) ? $data['defaultCoupon'] : null;
diff --git a/lib/Model/CreateCoupons.php b/lib/Model/CreateCoupons.php
index d082036..1bbc09e 100644
--- a/lib/Model/CreateCoupons.php
+++ b/lib/Model/CreateCoupons.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['collectionId'] = isset($data['collectionId']) ? $data['collectionId'] : null;
         $this->container['coupons'] = isset($data['coupons']) ? $data['coupons'] : null;
diff --git a/lib/Model/CreateDoiContact.php b/lib/Model/CreateDoiContact.php
index c4df173..3849fbb 100644
--- a/lib/Model/CreateDoiContact.php
+++ b/lib/Model/CreateDoiContact.php
@@ -200,7 +200,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/CreateDomain.php b/lib/Model/CreateDomain.php
index bc67da0..3f7af0c 100644
--- a/lib/Model/CreateDomain.php
+++ b/lib/Model/CreateDomain.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
     }
diff --git a/lib/Model/CreateDomainModel.php b/lib/Model/CreateDomainModel.php
index edc3756..95a40b2 100644
--- a/lib/Model/CreateDomainModel.php
+++ b/lib/Model/CreateDomainModel.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['domainName'] = isset($data['domainName']) ? $data['domainName'] : null;
diff --git a/lib/Model/CreateDomainModelDnsRecords.php b/lib/Model/CreateDomainModelDnsRecords.php
index 5ba3983..83ada7e 100644
--- a/lib/Model/CreateDomainModelDnsRecords.php
+++ b/lib/Model/CreateDomainModelDnsRecords.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['dkimRecord'] = isset($data['dkimRecord']) ? $data['dkimRecord'] : null;
         $this->container['brevoCode'] = isset($data['brevoCode']) ? $data['brevoCode'] : null;
diff --git a/lib/Model/CreateDomainModelDnsRecordsDkimRecord.php b/lib/Model/CreateDomainModelDnsRecordsDkimRecord.php
index 83bfad1..42de3f4 100644
--- a/lib/Model/CreateDomainModelDnsRecordsDkimRecord.php
+++ b/lib/Model/CreateDomainModelDnsRecordsDkimRecord.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
diff --git a/lib/Model/CreateEmailCampaign.php b/lib/Model/CreateEmailCampaign.php
index 5bb1049..0b15491 100644
--- a/lib/Model/CreateEmailCampaign.php
+++ b/lib/Model/CreateEmailCampaign.php
@@ -340,7 +340,7 @@ public function getWinnerCriteriaAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['tag'] = isset($data['tag']) ? $data['tag'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/CreateEmailCampaignRecipients.php b/lib/Model/CreateEmailCampaignRecipients.php
index c4d1cb5..e3520ab 100644
--- a/lib/Model/CreateEmailCampaignRecipients.php
+++ b/lib/Model/CreateEmailCampaignRecipients.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['exclusionListIds'] = isset($data['exclusionListIds']) ? $data['exclusionListIds'] : null;
         $this->container['listIds'] = isset($data['listIds']) ? $data['listIds'] : null;
diff --git a/lib/Model/CreateEmailCampaignSender.php b/lib/Model/CreateEmailCampaignSender.php
index 5b7185b..6e542bd 100644
--- a/lib/Model/CreateEmailCampaignSender.php
+++ b/lib/Model/CreateEmailCampaignSender.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/CreateExternalFeed.php b/lib/Model/CreateExternalFeed.php
index fa3fa2d..7c5fc5b 100644
--- a/lib/Model/CreateExternalFeed.php
+++ b/lib/Model/CreateExternalFeed.php
@@ -232,7 +232,7 @@ public function getAuthTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
diff --git a/lib/Model/CreateList.php b/lib/Model/CreateList.php
index 05a9f9f..a24c3eb 100644
--- a/lib/Model/CreateList.php
+++ b/lib/Model/CreateList.php
@@ -177,7 +177,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['folderId'] = isset($data['folderId']) ? $data['folderId'] : null;
diff --git a/lib/Model/CreateModel.php b/lib/Model/CreateModel.php
index 921fdd7..7cd86b7 100644
--- a/lib/Model/CreateModel.php
+++ b/lib/Model/CreateModel.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/CreateProductModel.php b/lib/Model/CreateProductModel.php
index 4d475ea..0654059 100644
--- a/lib/Model/CreateProductModel.php
+++ b/lib/Model/CreateProductModel.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/CreateReseller.php b/lib/Model/CreateReseller.php
index e9cc84d..2135116 100644
--- a/lib/Model/CreateReseller.php
+++ b/lib/Model/CreateReseller.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['authKey'] = isset($data['authKey']) ? $data['authKey'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/CreateSender.php b/lib/Model/CreateSender.php
index 99c6e86..e76d0d9 100644
--- a/lib/Model/CreateSender.php
+++ b/lib/Model/CreateSender.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/CreateSenderIps.php b/lib/Model/CreateSenderIps.php
index e2f5c77..d4de117 100644
--- a/lib/Model/CreateSenderIps.php
+++ b/lib/Model/CreateSenderIps.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
diff --git a/lib/Model/CreateSenderModel.php b/lib/Model/CreateSenderModel.php
index d1c6d02..87468bd 100644
--- a/lib/Model/CreateSenderModel.php
+++ b/lib/Model/CreateSenderModel.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['spfError'] = isset($data['spfError']) ? $data['spfError'] : null;
diff --git a/lib/Model/CreateSmsCampaign.php b/lib/Model/CreateSmsCampaign.php
index af82549..1c32bf9 100644
--- a/lib/Model/CreateSmsCampaign.php
+++ b/lib/Model/CreateSmsCampaign.php
@@ -210,7 +210,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/CreateSmsCampaignRecipients.php b/lib/Model/CreateSmsCampaignRecipients.php
index 080776a..2d31b63 100644
--- a/lib/Model/CreateSmsCampaignRecipients.php
+++ b/lib/Model/CreateSmsCampaignRecipients.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['listIds'] = isset($data['listIds']) ? $data['listIds'] : null;
         $this->container['exclusionListIds'] = isset($data['exclusionListIds']) ? $data['exclusionListIds'] : null;
diff --git a/lib/Model/CreateSmtpEmail.php b/lib/Model/CreateSmtpEmail.php
index 5f2a3a5..a48a476 100644
--- a/lib/Model/CreateSmtpEmail.php
+++ b/lib/Model/CreateSmtpEmail.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['messageId'] = isset($data['messageId']) ? $data['messageId'] : null;
         $this->container['messageIds'] = isset($data['messageIds']) ? $data['messageIds'] : null;
diff --git a/lib/Model/CreateSmtpTemplate.php b/lib/Model/CreateSmtpTemplate.php
index 1953e4f..fb4c415 100644
--- a/lib/Model/CreateSmtpTemplate.php
+++ b/lib/Model/CreateSmtpTemplate.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['tag'] = isset($data['tag']) ? $data['tag'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/CreateSmtpTemplateSender.php b/lib/Model/CreateSmtpTemplateSender.php
index e208b3a..6517477 100644
--- a/lib/Model/CreateSmtpTemplateSender.php
+++ b/lib/Model/CreateSmtpTemplateSender.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/CreateSubAccount.php b/lib/Model/CreateSubAccount.php
index ee0fbb6..16fe3b1 100644
--- a/lib/Model/CreateSubAccount.php
+++ b/lib/Model/CreateSubAccount.php
@@ -213,7 +213,7 @@ public function getLanguageAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['companyName'] = isset($data['companyName']) ? $data['companyName'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/CreateSubAccountResponse.php b/lib/Model/CreateSubAccountResponse.php
index f542695..23971f9 100644
--- a/lib/Model/CreateSubAccountResponse.php
+++ b/lib/Model/CreateSubAccountResponse.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/CreateUpdateBatchCategory.php b/lib/Model/CreateUpdateBatchCategory.php
index 900b9aa..a17001a 100644
--- a/lib/Model/CreateUpdateBatchCategory.php
+++ b/lib/Model/CreateUpdateBatchCategory.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['categories'] = isset($data['categories']) ? $data['categories'] : null;
         $this->container['updateEnabled'] = isset($data['updateEnabled']) ? $data['updateEnabled'] : null;
diff --git a/lib/Model/CreateUpdateBatchCategoryModel.php b/lib/Model/CreateUpdateBatchCategoryModel.php
index 5777db1..f4d1d07 100644
--- a/lib/Model/CreateUpdateBatchCategoryModel.php
+++ b/lib/Model/CreateUpdateBatchCategoryModel.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['createdCount'] = isset($data['createdCount']) ? $data['createdCount'] : null;
         $this->container['updatedCount'] = isset($data['updatedCount']) ? $data['updatedCount'] : null;
diff --git a/lib/Model/CreateUpdateBatchProducts.php b/lib/Model/CreateUpdateBatchProducts.php
index 082c8d2..db5b3f9 100644
--- a/lib/Model/CreateUpdateBatchProducts.php
+++ b/lib/Model/CreateUpdateBatchProducts.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['products'] = isset($data['products']) ? $data['products'] : null;
         $this->container['updateEnabled'] = isset($data['updateEnabled']) ? $data['updateEnabled'] : null;
diff --git a/lib/Model/CreateUpdateBatchProductsModel.php b/lib/Model/CreateUpdateBatchProductsModel.php
index e11a883..fdac341 100644
--- a/lib/Model/CreateUpdateBatchProductsModel.php
+++ b/lib/Model/CreateUpdateBatchProductsModel.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['createdCount'] = isset($data['createdCount']) ? $data['createdCount'] : null;
         $this->container['updatedCount'] = isset($data['updatedCount']) ? $data['updatedCount'] : null;
diff --git a/lib/Model/CreateUpdateCategories.php b/lib/Model/CreateUpdateCategories.php
index 7aa5c11..1b4910f 100644
--- a/lib/Model/CreateUpdateCategories.php
+++ b/lib/Model/CreateUpdateCategories.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/CreateUpdateCategory.php b/lib/Model/CreateUpdateCategory.php
index 3bfdcf4..3007a02 100644
--- a/lib/Model/CreateUpdateCategory.php
+++ b/lib/Model/CreateUpdateCategory.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/CreateUpdateContactModel.php b/lib/Model/CreateUpdateContactModel.php
index 19a6284..7d797a5 100644
--- a/lib/Model/CreateUpdateContactModel.php
+++ b/lib/Model/CreateUpdateContactModel.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/CreateUpdateFolder.php b/lib/Model/CreateUpdateFolder.php
index b3cf1dd..3c8e98e 100644
--- a/lib/Model/CreateUpdateFolder.php
+++ b/lib/Model/CreateUpdateFolder.php
@@ -172,7 +172,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
     }
diff --git a/lib/Model/CreateUpdateProduct.php b/lib/Model/CreateUpdateProduct.php
index 8fd883d..df09914 100644
--- a/lib/Model/CreateUpdateProduct.php
+++ b/lib/Model/CreateUpdateProduct.php
@@ -225,7 +225,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/CreateUpdateProducts.php b/lib/Model/CreateUpdateProducts.php
index d519d05..9bd0b2c 100644
--- a/lib/Model/CreateUpdateProducts.php
+++ b/lib/Model/CreateUpdateProducts.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/CreateWebhook.php b/lib/Model/CreateWebhook.php
index 4f93c07..738ee9a 100644
--- a/lib/Model/CreateWebhook.php
+++ b/lib/Model/CreateWebhook.php
@@ -272,7 +272,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
         $this->container['description'] = isset($data['description']) ? $data['description'] : null;
diff --git a/lib/Model/CreateWhatsAppCampaign.php b/lib/Model/CreateWhatsAppCampaign.php
index d6faa21..26c26a6 100644
--- a/lib/Model/CreateWhatsAppCampaign.php
+++ b/lib/Model/CreateWhatsAppCampaign.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['templateId'] = isset($data['templateId']) ? $data['templateId'] : null;
diff --git a/lib/Model/CreateWhatsAppCampaignRecipients.php b/lib/Model/CreateWhatsAppCampaignRecipients.php
index 78311df..bdae4ff 100644
--- a/lib/Model/CreateWhatsAppCampaignRecipients.php
+++ b/lib/Model/CreateWhatsAppCampaignRecipients.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['excludedListIds'] = isset($data['excludedListIds']) ? $data['excludedListIds'] : null;
         $this->container['listIds'] = isset($data['listIds']) ? $data['listIds'] : null;
diff --git a/lib/Model/CreateWhatsAppTemplate.php b/lib/Model/CreateWhatsAppTemplate.php
index 73d7f8a..0f8b3a1 100644
--- a/lib/Model/CreateWhatsAppTemplate.php
+++ b/lib/Model/CreateWhatsAppTemplate.php
@@ -235,7 +235,7 @@ public function getSourceAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['language'] = isset($data['language']) ? $data['language'] : null;
diff --git a/lib/Model/CreatedBatchId.php b/lib/Model/CreatedBatchId.php
index 28812b8..1853f4b 100644
--- a/lib/Model/CreatedBatchId.php
+++ b/lib/Model/CreatedBatchId.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['batchId'] = isset($data['batchId']) ? $data['batchId'] : null;
     }
diff --git a/lib/Model/CreatedProcessId.php b/lib/Model/CreatedProcessId.php
index 96341df..62bbd9e 100644
--- a/lib/Model/CreatedProcessId.php
+++ b/lib/Model/CreatedProcessId.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['processId'] = isset($data['processId']) ? $data['processId'] : null;
     }
diff --git a/lib/Model/Deal.php b/lib/Model/Deal.php
index a315359..c006fc6 100644
--- a/lib/Model/Deal.php
+++ b/lib/Model/Deal.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/DealAttributes.php b/lib/Model/DealAttributes.php
index 1ff6bf9..b9f30ed 100644
--- a/lib/Model/DealAttributes.php
+++ b/lib/Model/DealAttributes.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/DealAttributesInner.php b/lib/Model/DealAttributesInner.php
index 23144be..b08451e 100644
--- a/lib/Model/DealAttributesInner.php
+++ b/lib/Model/DealAttributesInner.php
@@ -196,7 +196,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['internalName'] = isset($data['internalName']) ? $data['internalName'] : null;
         $this->container['label'] = isset($data['label']) ? $data['label'] : null;
diff --git a/lib/Model/DealsList.php b/lib/Model/DealsList.php
index f517903..24b17e4 100644
--- a/lib/Model/DealsList.php
+++ b/lib/Model/DealsList.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['items'] = isset($data['items']) ? $data['items'] : null;
     }
diff --git a/lib/Model/DeleteHardbounces.php b/lib/Model/DeleteHardbounces.php
index fd256f5..1afa787 100644
--- a/lib/Model/DeleteHardbounces.php
+++ b/lib/Model/DeleteHardbounces.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['startDate'] = isset($data['startDate']) ? $data['startDate'] : null;
         $this->container['endDate'] = isset($data['endDate']) ? $data['endDate'] : null;
diff --git a/lib/Model/EmailExportRecipients.php b/lib/Model/EmailExportRecipients.php
index 4489fd9..43b5e5d 100644
--- a/lib/Model/EmailExportRecipients.php
+++ b/lib/Model/EmailExportRecipients.php
@@ -207,7 +207,7 @@ public function getRecipientsTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['notifyURL'] = isset($data['notifyURL']) ? $data['notifyURL'] : null;
         $this->container['recipientsType'] = isset($data['recipientsType']) ? $data['recipientsType'] : null;
diff --git a/lib/Model/Event.php b/lib/Model/Event.php
index 8335cfe..cd83dc6 100644
--- a/lib/Model/Event.php
+++ b/lib/Model/Event.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['eventName'] = isset($data['eventName']) ? $data['eventName'] : null;
         $this->container['eventDate'] = isset($data['eventDate']) ? $data['eventDate'] : null;
diff --git a/lib/Model/EventIdentifiers.php b/lib/Model/EventIdentifiers.php
index a71997e..e0d5d99 100644
--- a/lib/Model/EventIdentifiers.php
+++ b/lib/Model/EventIdentifiers.php
@@ -196,7 +196,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['emailId'] = isset($data['emailId']) ? $data['emailId'] : null;
         $this->container['phoneId'] = isset($data['phoneId']) ? $data['phoneId'] : null;
diff --git a/lib/Model/ExportWebhooksHistory.php b/lib/Model/ExportWebhooksHistory.php
index 4d36844..987ea08 100644
--- a/lib/Model/ExportWebhooksHistory.php
+++ b/lib/Model/ExportWebhooksHistory.php
@@ -280,7 +280,7 @@ public function getEventAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['days'] = isset($data['days']) ? $data['days'] : null;
         $this->container['startDate'] = isset($data['startDate']) ? $data['startDate'] : null;
diff --git a/lib/Model/FileData.php b/lib/Model/FileData.php
index 7b7ef4f..201fc95 100644
--- a/lib/Model/FileData.php
+++ b/lib/Model/FileData.php
@@ -226,7 +226,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/FileDownloadableLink.php b/lib/Model/FileDownloadableLink.php
index 003c6c6..1197505 100644
--- a/lib/Model/FileDownloadableLink.php
+++ b/lib/Model/FileDownloadableLink.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['fileUrl'] = isset($data['fileUrl']) ? $data['fileUrl'] : null;
     }
diff --git a/lib/Model/FileList.php b/lib/Model/FileList.php
index 9fe810f..38a88a4 100644
--- a/lib/Model/FileList.php
+++ b/lib/Model/FileList.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetAccount.php b/lib/Model/GetAccount.php
index fe969b4..391c16a 100644
--- a/lib/Model/GetAccount.php
+++ b/lib/Model/GetAccount.php
@@ -177,7 +177,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/GetAccountActivity.php b/lib/Model/GetAccountActivity.php
index 6d48d87..da2643d 100644
--- a/lib/Model/GetAccountActivity.php
+++ b/lib/Model/GetAccountActivity.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['logs'] = isset($data['logs']) ? $data['logs'] : null;
     }
diff --git a/lib/Model/GetAccountActivityLogs.php b/lib/Model/GetAccountActivityLogs.php
index 4e4baa1..8ee4157 100644
--- a/lib/Model/GetAccountActivityLogs.php
+++ b/lib/Model/GetAccountActivityLogs.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['action'] = isset($data['action']) ? $data['action'] : null;
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
diff --git a/lib/Model/GetAccountMarketingAutomation.php b/lib/Model/GetAccountMarketingAutomation.php
index fa2ee05..ab62960 100644
--- a/lib/Model/GetAccountMarketingAutomation.php
+++ b/lib/Model/GetAccountMarketingAutomation.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['key'] = isset($data['key']) ? $data['key'] : null;
         $this->container['enabled'] = isset($data['enabled']) ? $data['enabled'] : null;
diff --git a/lib/Model/GetAccountPlan.php b/lib/Model/GetAccountPlan.php
index caadcb8..7da51c7 100644
--- a/lib/Model/GetAccountPlan.php
+++ b/lib/Model/GetAccountPlan.php
@@ -234,7 +234,7 @@ public function getCreditsTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
         $this->container['creditsType'] = isset($data['creditsType']) ? $data['creditsType'] : null;
diff --git a/lib/Model/GetAccountRelay.php b/lib/Model/GetAccountRelay.php
index 7af1aa4..a0f3b44 100644
--- a/lib/Model/GetAccountRelay.php
+++ b/lib/Model/GetAccountRelay.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['enabled'] = isset($data['enabled']) ? $data['enabled'] : null;
         $this->container['data'] = isset($data['data']) ? $data['data'] : null;
diff --git a/lib/Model/GetAccountRelayData.php b/lib/Model/GetAccountRelayData.php
index c9ef3b9..81fd075 100644
--- a/lib/Model/GetAccountRelayData.php
+++ b/lib/Model/GetAccountRelayData.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['userName'] = isset($data['userName']) ? $data['userName'] : null;
         $this->container['relay'] = isset($data['relay']) ? $data['relay'] : null;
diff --git a/lib/Model/GetAggregatedReport.php b/lib/Model/GetAggregatedReport.php
index 3ab89d2..9f8eecb 100644
--- a/lib/Model/GetAggregatedReport.php
+++ b/lib/Model/GetAggregatedReport.php
@@ -235,7 +235,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['range'] = isset($data['range']) ? $data['range'] : null;
         $this->container['requests'] = isset($data['requests']) ? $data['requests'] : null;
diff --git a/lib/Model/GetAllExternalFeeds.php b/lib/Model/GetAllExternalFeeds.php
index 5d2a4d9..3c3c9a9 100644
--- a/lib/Model/GetAllExternalFeeds.php
+++ b/lib/Model/GetAllExternalFeeds.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['feeds'] = isset($data['feeds']) ? $data['feeds'] : null;
diff --git a/lib/Model/GetAllExternalFeedsFeeds.php b/lib/Model/GetAllExternalFeedsFeeds.php
index fa998bd..d904c08 100644
--- a/lib/Model/GetAllExternalFeedsFeeds.php
+++ b/lib/Model/GetAllExternalFeedsFeeds.php
@@ -247,7 +247,7 @@ public function getAuthTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetAttributes.php b/lib/Model/GetAttributes.php
index 6be1d69..1d30c80 100644
--- a/lib/Model/GetAttributes.php
+++ b/lib/Model/GetAttributes.php
@@ -172,7 +172,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
     }
diff --git a/lib/Model/GetAttributesAttributes.php b/lib/Model/GetAttributesAttributes.php
index bb92fc0..75ac532 100644
--- a/lib/Model/GetAttributesAttributes.php
+++ b/lib/Model/GetAttributesAttributes.php
@@ -237,7 +237,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['category'] = isset($data['category']) ? $data['category'] : null;
diff --git a/lib/Model/GetAttributesEnumeration.php b/lib/Model/GetAttributesEnumeration.php
index 1f2b9d3..4762e2c 100644
--- a/lib/Model/GetAttributesEnumeration.php
+++ b/lib/Model/GetAttributesEnumeration.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['label'] = isset($data['label']) ? $data['label'] : null;
diff --git a/lib/Model/GetBlockedDomains.php b/lib/Model/GetBlockedDomains.php
index a2e5808..37ea9ee 100644
--- a/lib/Model/GetBlockedDomains.php
+++ b/lib/Model/GetBlockedDomains.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domains'] = isset($data['domains']) ? $data['domains'] : null;
     }
diff --git a/lib/Model/GetCampaignRecipients.php b/lib/Model/GetCampaignRecipients.php
index 70bc51a..0ae9200 100644
--- a/lib/Model/GetCampaignRecipients.php
+++ b/lib/Model/GetCampaignRecipients.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['lists'] = isset($data['lists']) ? $data['lists'] : null;
         $this->container['exclusionLists'] = isset($data['exclusionLists']) ? $data['exclusionLists'] : null;
diff --git a/lib/Model/GetCampaignStats.php b/lib/Model/GetCampaignStats.php
index 73b0cb5..8330eac 100644
--- a/lib/Model/GetCampaignStats.php
+++ b/lib/Model/GetCampaignStats.php
@@ -252,7 +252,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['listId'] = isset($data['listId']) ? $data['listId'] : null;
         $this->container['uniqueClicks'] = isset($data['uniqueClicks']) ? $data['uniqueClicks'] : null;
diff --git a/lib/Model/GetCategories.php b/lib/Model/GetCategories.php
index 596ab12..e8993ce 100644
--- a/lib/Model/GetCategories.php
+++ b/lib/Model/GetCategories.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['categories'] = isset($data['categories']) ? $data['categories'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetCategoryDetails.php b/lib/Model/GetCategoryDetails.php
index 0b4d072..737aedd 100644
--- a/lib/Model/GetCategoryDetails.php
+++ b/lib/Model/GetCategoryDetails.php
@@ -200,7 +200,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetChildAccountCreationStatus.php b/lib/Model/GetChildAccountCreationStatus.php
index 33d8821..0f2a272 100644
--- a/lib/Model/GetChildAccountCreationStatus.php
+++ b/lib/Model/GetChildAccountCreationStatus.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['childAccountCreated'] = isset($data['childAccountCreated']) ? $data['childAccountCreated'] : null;
     }
diff --git a/lib/Model/GetChildDomain.php b/lib/Model/GetChildDomain.php
index 0fe663a..2111efe 100644
--- a/lib/Model/GetChildDomain.php
+++ b/lib/Model/GetChildDomain.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
         $this->container['active'] = isset($data['active']) ? $data['active'] : null;
diff --git a/lib/Model/GetChildDomains.php b/lib/Model/GetChildDomains.php
index b54947f..46b417c 100644
--- a/lib/Model/GetChildDomains.php
+++ b/lib/Model/GetChildDomains.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetChildInfo.php b/lib/Model/GetChildInfo.php
index 0b909b7..78f9cad 100644
--- a/lib/Model/GetChildInfo.php
+++ b/lib/Model/GetChildInfo.php
@@ -187,7 +187,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/GetChildInfoApiKeys.php b/lib/Model/GetChildInfoApiKeys.php
index 63fd407..6042b3c 100644
--- a/lib/Model/GetChildInfoApiKeys.php
+++ b/lib/Model/GetChildInfoApiKeys.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['v2'] = isset($data['v2']) ? $data['v2'] : null;
         $this->container['v3'] = isset($data['v3']) ? $data['v3'] : null;
diff --git a/lib/Model/GetChildInfoApiKeysV2.php b/lib/Model/GetChildInfoApiKeysV2.php
index 4215b8a..1027ce3 100644
--- a/lib/Model/GetChildInfoApiKeysV2.php
+++ b/lib/Model/GetChildInfoApiKeysV2.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['key'] = isset($data['key']) ? $data['key'] : null;
diff --git a/lib/Model/GetChildInfoApiKeysV3.php b/lib/Model/GetChildInfoApiKeysV3.php
index 8b58a1f..95fdd6a 100644
--- a/lib/Model/GetChildInfoApiKeysV3.php
+++ b/lib/Model/GetChildInfoApiKeysV3.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['key'] = isset($data['key']) ? $data['key'] : null;
diff --git a/lib/Model/GetChildInfoCredits.php b/lib/Model/GetChildInfoCredits.php
index b79dd86..633a5a4 100644
--- a/lib/Model/GetChildInfoCredits.php
+++ b/lib/Model/GetChildInfoCredits.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['emailCredits'] = isset($data['emailCredits']) ? $data['emailCredits'] : null;
         $this->container['smsCredits'] = isset($data['smsCredits']) ? $data['smsCredits'] : null;
diff --git a/lib/Model/GetChildInfoStatistics.php b/lib/Model/GetChildInfoStatistics.php
index 730f10d..79d97dc 100644
--- a/lib/Model/GetChildInfoStatistics.php
+++ b/lib/Model/GetChildInfoStatistics.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['previousMonthTotalSent'] = isset($data['previousMonthTotalSent']) ? $data['previousMonthTotalSent'] : null;
         $this->container['currentMonthTotalSent'] = isset($data['currentMonthTotalSent']) ? $data['currentMonthTotalSent'] : null;
diff --git a/lib/Model/GetChildrenList.php b/lib/Model/GetChildrenList.php
index 0d48062..c267aaa 100644
--- a/lib/Model/GetChildrenList.php
+++ b/lib/Model/GetChildrenList.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['children'] = isset($data['children']) ? $data['children'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetClient.php b/lib/Model/GetClient.php
index 53d7b2f..be4035e 100644
--- a/lib/Model/GetClient.php
+++ b/lib/Model/GetClient.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['firstName'] = isset($data['firstName']) ? $data['firstName'] : null;
diff --git a/lib/Model/GetContactCampaignStats.php b/lib/Model/GetContactCampaignStats.php
index 963af44..dd1ab18 100644
--- a/lib/Model/GetContactCampaignStats.php
+++ b/lib/Model/GetContactCampaignStats.php
@@ -216,7 +216,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['messagesSent'] = isset($data['messagesSent']) ? $data['messagesSent'] : null;
         $this->container['hardBounces'] = isset($data['hardBounces']) ? $data['hardBounces'] : null;
diff --git a/lib/Model/GetContactCampaignStatsClicked.php b/lib/Model/GetContactCampaignStatsClicked.php
index 8dc1d58..237c394 100644
--- a/lib/Model/GetContactCampaignStatsClicked.php
+++ b/lib/Model/GetContactCampaignStatsClicked.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['links'] = isset($data['links']) ? $data['links'] : null;
diff --git a/lib/Model/GetContactCampaignStatsOpened.php b/lib/Model/GetContactCampaignStatsOpened.php
index fd17f29..8b8e681 100644
--- a/lib/Model/GetContactCampaignStatsOpened.php
+++ b/lib/Model/GetContactCampaignStatsOpened.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetContactCampaignStatsTransacAttributes.php b/lib/Model/GetContactCampaignStatsTransacAttributes.php
index e070a8f..7cd7b52 100644
--- a/lib/Model/GetContactCampaignStatsTransacAttributes.php
+++ b/lib/Model/GetContactCampaignStatsTransacAttributes.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['orderDate'] = isset($data['orderDate']) ? $data['orderDate'] : null;
         $this->container['orderPrice'] = isset($data['orderPrice']) ? $data['orderPrice'] : null;
diff --git a/lib/Model/GetContactCampaignStatsUnsubscriptions.php b/lib/Model/GetContactCampaignStatsUnsubscriptions.php
index 801f31d..4eaadb4 100644
--- a/lib/Model/GetContactCampaignStatsUnsubscriptions.php
+++ b/lib/Model/GetContactCampaignStatsUnsubscriptions.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['userUnsubscription'] = isset($data['userUnsubscription']) ? $data['userUnsubscription'] : null;
         $this->container['adminUnsubscription'] = isset($data['adminUnsubscription']) ? $data['adminUnsubscription'] : null;
diff --git a/lib/Model/GetContactDetails.php b/lib/Model/GetContactDetails.php
index ee62408..29656e6 100644
--- a/lib/Model/GetContactDetails.php
+++ b/lib/Model/GetContactDetails.php
@@ -212,7 +212,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/GetContacts.php b/lib/Model/GetContacts.php
index 80321f8..62987da 100644
--- a/lib/Model/GetContacts.php
+++ b/lib/Model/GetContacts.php
@@ -177,7 +177,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['contacts'] = isset($data['contacts']) ? $data['contacts'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetCorporateInvitedUsersList.php b/lib/Model/GetCorporateInvitedUsersList.php
index 989c089..60a04d9 100644
--- a/lib/Model/GetCorporateInvitedUsersList.php
+++ b/lib/Model/GetCorporateInvitedUsersList.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['users'] = isset($data['users']) ? $data['users'] : null;
     }
diff --git a/lib/Model/GetCorporateInvitedUsersListFeatureAccess.php b/lib/Model/GetCorporateInvitedUsersListFeatureAccess.php
index 38544b2..8163858 100644
--- a/lib/Model/GetCorporateInvitedUsersListFeatureAccess.php
+++ b/lib/Model/GetCorporateInvitedUsersListFeatureAccess.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['userManagement'] = isset($data['userManagement']) ? $data['userManagement'] : null;
         $this->container['apiKeys'] = isset($data['apiKeys']) ? $data['apiKeys'] : null;
diff --git a/lib/Model/GetCorporateInvitedUsersListGroups.php b/lib/Model/GetCorporateInvitedUsersListGroups.php
index c6c882b..2ca4857 100644
--- a/lib/Model/GetCorporateInvitedUsersListGroups.php
+++ b/lib/Model/GetCorporateInvitedUsersListGroups.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetCorporateInvitedUsersListUsers.php b/lib/Model/GetCorporateInvitedUsersListUsers.php
index 1bb9cae..184781a 100644
--- a/lib/Model/GetCorporateInvitedUsersListUsers.php
+++ b/lib/Model/GetCorporateInvitedUsersListUsers.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['groups'] = isset($data['groups']) ? $data['groups'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/GetCouponCollection.php b/lib/Model/GetCouponCollection.php
index 69d4b47..b4bc702 100644
--- a/lib/Model/GetCouponCollection.php
+++ b/lib/Model/GetCouponCollection.php
@@ -200,7 +200,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetDeviceBrowserStats.php b/lib/Model/GetDeviceBrowserStats.php
index 81a3e75..a67a051 100644
--- a/lib/Model/GetDeviceBrowserStats.php
+++ b/lib/Model/GetDeviceBrowserStats.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['clickers'] = isset($data['clickers']) ? $data['clickers'] : null;
         $this->container['uniqueClicks'] = isset($data['uniqueClicks']) ? $data['uniqueClicks'] : null;
diff --git a/lib/Model/GetDomainConfigurationModel.php b/lib/Model/GetDomainConfigurationModel.php
index 52ee44b..69af527 100644
--- a/lib/Model/GetDomainConfigurationModel.php
+++ b/lib/Model/GetDomainConfigurationModel.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
         $this->container['verified'] = isset($data['verified']) ? $data['verified'] : null;
diff --git a/lib/Model/GetDomainsList.php b/lib/Model/GetDomainsList.php
index 1ed1db7..d8318ef 100644
--- a/lib/Model/GetDomainsList.php
+++ b/lib/Model/GetDomainsList.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domains'] = isset($data['domains']) ? $data['domains'] : null;
     }
diff --git a/lib/Model/GetDomainsListDomains.php b/lib/Model/GetDomainsListDomains.php
index 27d25bf..daf7c8f 100644
--- a/lib/Model/GetDomainsListDomains.php
+++ b/lib/Model/GetDomainsListDomains.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['domainName'] = isset($data['domainName']) ? $data['domainName'] : null;
diff --git a/lib/Model/GetEmailEventReport.php b/lib/Model/GetEmailEventReport.php
index 47d443e..3bbe6bf 100644
--- a/lib/Model/GetEmailEventReport.php
+++ b/lib/Model/GetEmailEventReport.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['events'] = isset($data['events']) ? $data['events'] : null;
     }
diff --git a/lib/Model/GetEmailEventReportEvents.php b/lib/Model/GetEmailEventReportEvents.php
index ccaef2f..09074cf 100644
--- a/lib/Model/GetEmailEventReportEvents.php
+++ b/lib/Model/GetEmailEventReportEvents.php
@@ -264,7 +264,7 @@ public function getEventAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
diff --git a/lib/Model/GetExtendedCampaignStats.php b/lib/Model/GetExtendedCampaignStats.php
index efe202a..4263189 100644
--- a/lib/Model/GetExtendedCampaignStats.php
+++ b/lib/Model/GetExtendedCampaignStats.php
@@ -210,7 +210,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['globalStats'] = isset($data['globalStats']) ? $data['globalStats'] : null;
         $this->container['campaignStats'] = isset($data['campaignStats']) ? $data['campaignStats'] : null;
diff --git a/lib/Model/GetExtendedCampaignStatsGlobalStats.php b/lib/Model/GetExtendedCampaignStatsGlobalStats.php
index 03d1ced..5b904a2 100644
--- a/lib/Model/GetExtendedCampaignStatsGlobalStats.php
+++ b/lib/Model/GetExtendedCampaignStatsGlobalStats.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetExtendedClient.php b/lib/Model/GetExtendedClient.php
index a4eb983..45c2366 100644
--- a/lib/Model/GetExtendedClient.php
+++ b/lib/Model/GetExtendedClient.php
@@ -167,7 +167,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/GetExtendedClientAddress.php b/lib/Model/GetExtendedClientAddress.php
index 7b4691f..a83cf6b 100644
--- a/lib/Model/GetExtendedClientAddress.php
+++ b/lib/Model/GetExtendedClientAddress.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['street'] = isset($data['street']) ? $data['street'] : null;
         $this->container['city'] = isset($data['city']) ? $data['city'] : null;
diff --git a/lib/Model/GetExtendedContactDetails.php b/lib/Model/GetExtendedContactDetails.php
index 6651b44..73bd7d1 100644
--- a/lib/Model/GetExtendedContactDetails.php
+++ b/lib/Model/GetExtendedContactDetails.php
@@ -221,7 +221,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatistics.php b/lib/Model/GetExtendedContactDetailsStatistics.php
index f5f05be..d737643 100644
--- a/lib/Model/GetExtendedContactDetailsStatistics.php
+++ b/lib/Model/GetExtendedContactDetailsStatistics.php
@@ -216,7 +216,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['messagesSent'] = isset($data['messagesSent']) ? $data['messagesSent'] : null;
         $this->container['hardBounces'] = isset($data['hardBounces']) ? $data['hardBounces'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsClicked.php b/lib/Model/GetExtendedContactDetailsStatisticsClicked.php
index ad3fbe3..7ebbf0b 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsClicked.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsClicked.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['links'] = isset($data['links']) ? $data['links'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsDelivered.php b/lib/Model/GetExtendedContactDetailsStatisticsDelivered.php
index 42aeeec..59f69a0 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsDelivered.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsDelivered.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['eventTime'] = isset($data['eventTime']) ? $data['eventTime'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsLinks.php b/lib/Model/GetExtendedContactDetailsStatisticsLinks.php
index 7365eb9..c476493 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsLinks.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsLinks.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['eventTime'] = isset($data['eventTime']) ? $data['eventTime'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsMessagesSent.php b/lib/Model/GetExtendedContactDetailsStatisticsMessagesSent.php
index be2cdac..ce1d327 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsMessagesSent.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsMessagesSent.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['eventTime'] = isset($data['eventTime']) ? $data['eventTime'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsOpened.php b/lib/Model/GetExtendedContactDetailsStatisticsOpened.php
index 00599ef..c2304c5 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsOpened.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsOpened.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptions.php b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptions.php
index 0105dec..efb9686 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptions.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptions.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['userUnsubscription'] = isset($data['userUnsubscription']) ? $data['userUnsubscription'] : null;
         $this->container['adminUnsubscription'] = isset($data['adminUnsubscription']) ? $data['adminUnsubscription'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsAdminUnsubscription.php b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsAdminUnsubscription.php
index 99a7b85..21b5fa9 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsAdminUnsubscription.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsAdminUnsubscription.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['eventTime'] = isset($data['eventTime']) ? $data['eventTime'] : null;
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
diff --git a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsUserUnsubscription.php b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsUserUnsubscription.php
index 6a9aaf9..ff00492 100644
--- a/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsUserUnsubscription.php
+++ b/lib/Model/GetExtendedContactDetailsStatisticsUnsubscriptionsUserUnsubscription.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['eventTime'] = isset($data['eventTime']) ? $data['eventTime'] : null;
diff --git a/lib/Model/GetExtendedList.php b/lib/Model/GetExtendedList.php
index 09f6804..b3c390c 100644
--- a/lib/Model/GetExtendedList.php
+++ b/lib/Model/GetExtendedList.php
@@ -182,7 +182,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         parent::__construct($data);
 
diff --git a/lib/Model/GetExtendedListCampaignStats.php b/lib/Model/GetExtendedListCampaignStats.php
index 468b511..982fa7c 100644
--- a/lib/Model/GetExtendedListCampaignStats.php
+++ b/lib/Model/GetExtendedListCampaignStats.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignId'] = isset($data['campaignId']) ? $data['campaignId'] : null;
         $this->container['stats'] = isset($data['stats']) ? $data['stats'] : null;
diff --git a/lib/Model/GetExternalFeedByUUID.php b/lib/Model/GetExternalFeedByUUID.php
index 685bda8..1d19371 100644
--- a/lib/Model/GetExternalFeedByUUID.php
+++ b/lib/Model/GetExternalFeedByUUID.php
@@ -247,7 +247,7 @@ public function getAuthTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetExternalFeedByUUIDHeaders.php b/lib/Model/GetExternalFeedByUUIDHeaders.php
index 29c89e1..dd2266f 100644
--- a/lib/Model/GetExternalFeedByUUIDHeaders.php
+++ b/lib/Model/GetExternalFeedByUUIDHeaders.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
diff --git a/lib/Model/GetFolder.php b/lib/Model/GetFolder.php
index 24b2fd1..911070f 100644
--- a/lib/Model/GetFolder.php
+++ b/lib/Model/GetFolder.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetFolderLists.php b/lib/Model/GetFolderLists.php
index 60b3c25..c3e20aa 100644
--- a/lib/Model/GetFolderLists.php
+++ b/lib/Model/GetFolderLists.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['lists'] = isset($data['lists']) ? $data['lists'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetFolders.php b/lib/Model/GetFolders.php
index 1935c41..c7adad7 100644
--- a/lib/Model/GetFolders.php
+++ b/lib/Model/GetFolders.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['folders'] = isset($data['folders']) ? $data['folders'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetInboundEmailEvents.php b/lib/Model/GetInboundEmailEvents.php
index c95405b..f27977c 100644
--- a/lib/Model/GetInboundEmailEvents.php
+++ b/lib/Model/GetInboundEmailEvents.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['events'] = isset($data['events']) ? $data['events'] : null;
     }
diff --git a/lib/Model/GetInboundEmailEventsByUuid.php b/lib/Model/GetInboundEmailEventsByUuid.php
index 5607781..729b476 100644
--- a/lib/Model/GetInboundEmailEventsByUuid.php
+++ b/lib/Model/GetInboundEmailEventsByUuid.php
@@ -210,7 +210,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['receivedAt'] = isset($data['receivedAt']) ? $data['receivedAt'] : null;
         $this->container['deliveredAt'] = isset($data['deliveredAt']) ? $data['deliveredAt'] : null;
diff --git a/lib/Model/GetInboundEmailEventsByUuidAttachments.php b/lib/Model/GetInboundEmailEventsByUuidAttachments.php
index ce25827..c55e14f 100644
--- a/lib/Model/GetInboundEmailEventsByUuidAttachments.php
+++ b/lib/Model/GetInboundEmailEventsByUuidAttachments.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['contentType'] = isset($data['contentType']) ? $data['contentType'] : null;
diff --git a/lib/Model/GetInboundEmailEventsByUuidLogs.php b/lib/Model/GetInboundEmailEventsByUuidLogs.php
index 3addbe4..6f9d8b2 100644
--- a/lib/Model/GetInboundEmailEventsByUuidLogs.php
+++ b/lib/Model/GetInboundEmailEventsByUuidLogs.php
@@ -199,7 +199,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
diff --git a/lib/Model/GetInboundEmailEventsEvents.php b/lib/Model/GetInboundEmailEventsEvents.php
index 966dc43..4baa767 100644
--- a/lib/Model/GetInboundEmailEventsEvents.php
+++ b/lib/Model/GetInboundEmailEventsEvents.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['uuid'] = isset($data['uuid']) ? $data['uuid'] : null;
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
diff --git a/lib/Model/GetInvitedUsersList.php b/lib/Model/GetInvitedUsersList.php
index 15e8982..21f23ed 100644
--- a/lib/Model/GetInvitedUsersList.php
+++ b/lib/Model/GetInvitedUsersList.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['users'] = isset($data['users']) ? $data['users'] : null;
     }
diff --git a/lib/Model/GetInvitedUsersListFeatureAccess.php b/lib/Model/GetInvitedUsersListFeatureAccess.php
index 07ad614..9458c98 100644
--- a/lib/Model/GetInvitedUsersListFeatureAccess.php
+++ b/lib/Model/GetInvitedUsersListFeatureAccess.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['marketing'] = isset($data['marketing']) ? $data['marketing'] : null;
         $this->container['conversations'] = isset($data['conversations']) ? $data['conversations'] : null;
diff --git a/lib/Model/GetInvitedUsersListUsers.php b/lib/Model/GetInvitedUsersListUsers.php
index 4978dd4..9271a76 100644
--- a/lib/Model/GetInvitedUsersListUsers.php
+++ b/lib/Model/GetInvitedUsersListUsers.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['isOwner'] = isset($data['isOwner']) ? $data['isOwner'] : null;
diff --git a/lib/Model/GetIp.php b/lib/Model/GetIp.php
index 322d6fc..fdb2b0b 100644
--- a/lib/Model/GetIp.php
+++ b/lib/Model/GetIp.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
diff --git a/lib/Model/GetIpFromSender.php b/lib/Model/GetIpFromSender.php
index 4802c9a..997b80d 100644
--- a/lib/Model/GetIpFromSender.php
+++ b/lib/Model/GetIpFromSender.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
diff --git a/lib/Model/GetIps.php b/lib/Model/GetIps.php
index fbd6cd4..4447028 100644
--- a/lib/Model/GetIps.php
+++ b/lib/Model/GetIps.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['ips'] = isset($data['ips']) ? $data['ips'] : null;
     }
diff --git a/lib/Model/GetIpsFromSender.php b/lib/Model/GetIpsFromSender.php
index de5b679..8ff158d 100644
--- a/lib/Model/GetIpsFromSender.php
+++ b/lib/Model/GetIpsFromSender.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['ips'] = isset($data['ips']) ? $data['ips'] : null;
     }
diff --git a/lib/Model/GetList.php b/lib/Model/GetList.php
index e01ef48..0a2c0a0 100644
--- a/lib/Model/GetList.php
+++ b/lib/Model/GetList.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetLists.php b/lib/Model/GetLists.php
index 57c93ee..192760d 100644
--- a/lib/Model/GetLists.php
+++ b/lib/Model/GetLists.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['lists'] = isset($data['lists']) ? $data['lists'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetOrders.php b/lib/Model/GetOrders.php
index cca4fc1..b3c54ad 100644
--- a/lib/Model/GetOrders.php
+++ b/lib/Model/GetOrders.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['orders'] = isset($data['orders']) ? $data['orders'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetProcess.php b/lib/Model/GetProcess.php
index 1bdea77..5a928b7 100644
--- a/lib/Model/GetProcess.php
+++ b/lib/Model/GetProcess.php
@@ -207,7 +207,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['status'] = isset($data['status']) ? $data['status'] : null;
diff --git a/lib/Model/GetProcesses.php b/lib/Model/GetProcesses.php
index c4ca6d5..016662b 100644
--- a/lib/Model/GetProcesses.php
+++ b/lib/Model/GetProcesses.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['processes'] = isset($data['processes']) ? $data['processes'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetProductDetails.php b/lib/Model/GetProductDetails.php
index 328ac97..633b140 100644
--- a/lib/Model/GetProductDetails.php
+++ b/lib/Model/GetProductDetails.php
@@ -245,7 +245,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetProducts.php b/lib/Model/GetProducts.php
index 3e432a0..a58d3df 100644
--- a/lib/Model/GetProducts.php
+++ b/lib/Model/GetProducts.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['products'] = isset($data['products']) ? $data['products'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetReports.php b/lib/Model/GetReports.php
index 07d8bf7..92c18c4 100644
--- a/lib/Model/GetReports.php
+++ b/lib/Model/GetReports.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['reports'] = isset($data['reports']) ? $data['reports'] : null;
     }
diff --git a/lib/Model/GetReportsReports.php b/lib/Model/GetReportsReports.php
index 49106d6..447c0aa 100644
--- a/lib/Model/GetReportsReports.php
+++ b/lib/Model/GetReportsReports.php
@@ -235,7 +235,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
         $this->container['requests'] = isset($data['requests']) ? $data['requests'] : null;
diff --git a/lib/Model/GetScheduledEmailByBatchId.php b/lib/Model/GetScheduledEmailByBatchId.php
index fc0ad3e..0463b96 100644
--- a/lib/Model/GetScheduledEmailByBatchId.php
+++ b/lib/Model/GetScheduledEmailByBatchId.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['batches'] = isset($data['batches']) ? $data['batches'] : null;
diff --git a/lib/Model/GetScheduledEmailByBatchIdBatches.php b/lib/Model/GetScheduledEmailByBatchIdBatches.php
index 59bc501..93fe0e7 100644
--- a/lib/Model/GetScheduledEmailByBatchIdBatches.php
+++ b/lib/Model/GetScheduledEmailByBatchIdBatches.php
@@ -204,7 +204,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['scheduledAt'] = isset($data['scheduledAt']) ? $data['scheduledAt'] : null;
         $this->container['createdAt'] = isset($data['createdAt']) ? $data['createdAt'] : null;
diff --git a/lib/Model/GetScheduledEmailByMessageId.php b/lib/Model/GetScheduledEmailByMessageId.php
index 7064a41..bfca62e 100644
--- a/lib/Model/GetScheduledEmailByMessageId.php
+++ b/lib/Model/GetScheduledEmailByMessageId.php
@@ -204,7 +204,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['scheduledAt'] = isset($data['scheduledAt']) ? $data['scheduledAt'] : null;
         $this->container['createdAt'] = isset($data['createdAt']) ? $data['createdAt'] : null;
diff --git a/lib/Model/GetSegments.php b/lib/Model/GetSegments.php
index 96c0b51..0c1d36f 100644
--- a/lib/Model/GetSegments.php
+++ b/lib/Model/GetSegments.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['segments'] = isset($data['segments']) ? $data['segments'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetSegmentsSegments.php b/lib/Model/GetSegmentsSegments.php
index fed8fc0..dfca4a8 100644
--- a/lib/Model/GetSegmentsSegments.php
+++ b/lib/Model/GetSegmentsSegments.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['segmentName'] = isset($data['segmentName']) ? $data['segmentName'] : null;
diff --git a/lib/Model/GetSendersList.php b/lib/Model/GetSendersList.php
index 4651dc8..12c70fb 100644
--- a/lib/Model/GetSendersList.php
+++ b/lib/Model/GetSendersList.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['senders'] = isset($data['senders']) ? $data['senders'] : null;
     }
diff --git a/lib/Model/GetSendersListIps.php b/lib/Model/GetSendersListIps.php
index 8bfc1fb..44a292f 100644
--- a/lib/Model/GetSendersListIps.php
+++ b/lib/Model/GetSendersListIps.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
diff --git a/lib/Model/GetSendersListSenders.php b/lib/Model/GetSendersListSenders.php
index b621f86..0792c63 100644
--- a/lib/Model/GetSendersListSenders.php
+++ b/lib/Model/GetSendersListSenders.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetSharedTemplateUrl.php b/lib/Model/GetSharedTemplateUrl.php
index 62e3eb3..9acffac 100644
--- a/lib/Model/GetSharedTemplateUrl.php
+++ b/lib/Model/GetSharedTemplateUrl.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sharedUrl'] = isset($data['sharedUrl']) ? $data['sharedUrl'] : null;
     }
diff --git a/lib/Model/GetSmsCampaign.php b/lib/Model/GetSmsCampaign.php
index 4499ec6..ed3c617 100644
--- a/lib/Model/GetSmsCampaign.php
+++ b/lib/Model/GetSmsCampaign.php
@@ -243,7 +243,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetSmsCampaignOverview.php b/lib/Model/GetSmsCampaignOverview.php
index 739cde9..f3801c3 100644
--- a/lib/Model/GetSmsCampaignOverview.php
+++ b/lib/Model/GetSmsCampaignOverview.php
@@ -233,7 +233,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetSmsCampaignRecipients.php b/lib/Model/GetSmsCampaignRecipients.php
index fecf2a6..92c5603 100644
--- a/lib/Model/GetSmsCampaignRecipients.php
+++ b/lib/Model/GetSmsCampaignRecipients.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetSmsCampaignStats.php b/lib/Model/GetSmsCampaignStats.php
index d6b528d..65b3850 100644
--- a/lib/Model/GetSmsCampaignStats.php
+++ b/lib/Model/GetSmsCampaignStats.php
@@ -205,7 +205,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['delivered'] = isset($data['delivered']) ? $data['delivered'] : null;
         $this->container['sent'] = isset($data['sent']) ? $data['sent'] : null;
diff --git a/lib/Model/GetSmsCampaigns.php b/lib/Model/GetSmsCampaigns.php
index 09a711d..9f217cd 100644
--- a/lib/Model/GetSmsCampaigns.php
+++ b/lib/Model/GetSmsCampaigns.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaigns'] = isset($data['campaigns']) ? $data['campaigns'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetSmsEventReport.php b/lib/Model/GetSmsEventReport.php
index 89833ec..3e18c84 100644
--- a/lib/Model/GetSmsEventReport.php
+++ b/lib/Model/GetSmsEventReport.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['events'] = isset($data['events']) ? $data['events'] : null;
     }
diff --git a/lib/Model/GetSmsEventReportEvents.php b/lib/Model/GetSmsEventReportEvents.php
index d10ee82..58d708c 100644
--- a/lib/Model/GetSmsEventReportEvents.php
+++ b/lib/Model/GetSmsEventReportEvents.php
@@ -236,7 +236,7 @@ public function getEventAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['phoneNumber'] = isset($data['phoneNumber']) ? $data['phoneNumber'] : null;
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
diff --git a/lib/Model/GetSmtpTemplateOverview.php b/lib/Model/GetSmtpTemplateOverview.php
index 4a42b55..1dcbd18 100644
--- a/lib/Model/GetSmtpTemplateOverview.php
+++ b/lib/Model/GetSmtpTemplateOverview.php
@@ -235,7 +235,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetSmtpTemplateOverviewSender.php b/lib/Model/GetSmtpTemplateOverviewSender.php
index c753826..c3e5e97 100644
--- a/lib/Model/GetSmtpTemplateOverviewSender.php
+++ b/lib/Model/GetSmtpTemplateOverviewSender.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/GetSmtpTemplates.php b/lib/Model/GetSmtpTemplates.php
index fd481a4..a257afc 100644
--- a/lib/Model/GetSmtpTemplates.php
+++ b/lib/Model/GetSmtpTemplates.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['templates'] = isset($data['templates']) ? $data['templates'] : null;
diff --git a/lib/Model/GetSsoToken.php b/lib/Model/GetSsoToken.php
index 37dd969..8bf8fce 100644
--- a/lib/Model/GetSsoToken.php
+++ b/lib/Model/GetSsoToken.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['token'] = isset($data['token']) ? $data['token'] : null;
     }
diff --git a/lib/Model/GetStatsByBrowser.php b/lib/Model/GetStatsByBrowser.php
index f999856..6e43127 100644
--- a/lib/Model/GetStatsByBrowser.php
+++ b/lib/Model/GetStatsByBrowser.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetStatsByDevice.php b/lib/Model/GetStatsByDevice.php
index ab3d9b5..dd7469a 100644
--- a/lib/Model/GetStatsByDevice.php
+++ b/lib/Model/GetStatsByDevice.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['desktop'] = isset($data['desktop']) ? $data['desktop'] : null;
         $this->container['mobile'] = isset($data['mobile']) ? $data['mobile'] : null;
diff --git a/lib/Model/GetStatsByDomain.php b/lib/Model/GetStatsByDomain.php
index fca7c01..e55fe72 100644
--- a/lib/Model/GetStatsByDomain.php
+++ b/lib/Model/GetStatsByDomain.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/GetTransacAggregatedSmsReport.php b/lib/Model/GetTransacAggregatedSmsReport.php
index 97c0af0..4803285 100644
--- a/lib/Model/GetTransacAggregatedSmsReport.php
+++ b/lib/Model/GetTransacAggregatedSmsReport.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['range'] = isset($data['range']) ? $data['range'] : null;
         $this->container['requests'] = isset($data['requests']) ? $data['requests'] : null;
diff --git a/lib/Model/GetTransacBlockedContacts.php b/lib/Model/GetTransacBlockedContacts.php
index 0481377..8c0dbdc 100644
--- a/lib/Model/GetTransacBlockedContacts.php
+++ b/lib/Model/GetTransacBlockedContacts.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['contacts'] = isset($data['contacts']) ? $data['contacts'] : null;
diff --git a/lib/Model/GetTransacBlockedContactsContacts.php b/lib/Model/GetTransacBlockedContactsContacts.php
index d66e52a..a8ef69f 100644
--- a/lib/Model/GetTransacBlockedContactsContacts.php
+++ b/lib/Model/GetTransacBlockedContactsContacts.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['senderEmail'] = isset($data['senderEmail']) ? $data['senderEmail'] : null;
diff --git a/lib/Model/GetTransacBlockedContactsReason.php b/lib/Model/GetTransacBlockedContactsReason.php
index ea51329..4fce5f1 100644
--- a/lib/Model/GetTransacBlockedContactsReason.php
+++ b/lib/Model/GetTransacBlockedContactsReason.php
@@ -204,7 +204,7 @@ public function getCodeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['code'] = isset($data['code']) ? $data['code'] : null;
         $this->container['message'] = isset($data['message']) ? $data['message'] : null;
diff --git a/lib/Model/GetTransacEmailContent.php b/lib/Model/GetTransacEmailContent.php
index 75e2357..1d0a5d0 100644
--- a/lib/Model/GetTransacEmailContent.php
+++ b/lib/Model/GetTransacEmailContent.php
@@ -205,7 +205,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['subject'] = isset($data['subject']) ? $data['subject'] : null;
diff --git a/lib/Model/GetTransacEmailContentEvents.php b/lib/Model/GetTransacEmailContentEvents.php
index 138080e..9118c6e 100644
--- a/lib/Model/GetTransacEmailContentEvents.php
+++ b/lib/Model/GetTransacEmailContentEvents.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['time'] = isset($data['time']) ? $data['time'] : null;
diff --git a/lib/Model/GetTransacSmsReport.php b/lib/Model/GetTransacSmsReport.php
index 9363b55..8cc2bff 100644
--- a/lib/Model/GetTransacSmsReport.php
+++ b/lib/Model/GetTransacSmsReport.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['reports'] = isset($data['reports']) ? $data['reports'] : null;
     }
diff --git a/lib/Model/GetTransacSmsReportReports.php b/lib/Model/GetTransacSmsReportReports.php
index 87d2bdd..f05fafb 100644
--- a/lib/Model/GetTransacSmsReportReports.php
+++ b/lib/Model/GetTransacSmsReportReports.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
         $this->container['requests'] = isset($data['requests']) ? $data['requests'] : null;
diff --git a/lib/Model/GetUserPermission.php b/lib/Model/GetUserPermission.php
index 5ce95fd..a3e1551 100644
--- a/lib/Model/GetUserPermission.php
+++ b/lib/Model/GetUserPermission.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['status'] = isset($data['status']) ? $data['status'] : null;
diff --git a/lib/Model/GetUserPermissionPrivileges.php b/lib/Model/GetUserPermissionPrivileges.php
index 03a5d17..db5a0ae 100644
--- a/lib/Model/GetUserPermissionPrivileges.php
+++ b/lib/Model/GetUserPermissionPrivileges.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['feature'] = isset($data['feature']) ? $data['feature'] : null;
         $this->container['permissions'] = isset($data['permissions']) ? $data['permissions'] : null;
diff --git a/lib/Model/GetWATemplates.php b/lib/Model/GetWATemplates.php
index 9d4eebd..3c7abe1 100644
--- a/lib/Model/GetWATemplates.php
+++ b/lib/Model/GetWATemplates.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['templates'] = isset($data['templates']) ? $data['templates'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetWATemplatesTemplates.php b/lib/Model/GetWATemplatesTemplates.php
index f1aef50..387e970 100644
--- a/lib/Model/GetWATemplatesTemplates.php
+++ b/lib/Model/GetWATemplatesTemplates.php
@@ -210,7 +210,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/GetWebhook.php b/lib/Model/GetWebhook.php
index 0e4871d..dd8791c 100644
--- a/lib/Model/GetWebhook.php
+++ b/lib/Model/GetWebhook.php
@@ -235,7 +235,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/GetWebhookAuth.php b/lib/Model/GetWebhookAuth.php
index 234333d..2bfcaae 100644
--- a/lib/Model/GetWebhookAuth.php
+++ b/lib/Model/GetWebhookAuth.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['type'] = isset($data['type']) ? $data['type'] : null;
         $this->container['token'] = isset($data['token']) ? $data['token'] : null;
diff --git a/lib/Model/GetWebhookHeaders.php b/lib/Model/GetWebhookHeaders.php
index aa1f6f0..ae959bb 100644
--- a/lib/Model/GetWebhookHeaders.php
+++ b/lib/Model/GetWebhookHeaders.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['key'] = isset($data['key']) ? $data['key'] : null;
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
diff --git a/lib/Model/GetWebhooks.php b/lib/Model/GetWebhooks.php
index 6737fe2..274fed6 100644
--- a/lib/Model/GetWebhooks.php
+++ b/lib/Model/GetWebhooks.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['webhooks'] = isset($data['webhooks']) ? $data['webhooks'] : null;
     }
diff --git a/lib/Model/GetWhatsAppConfig.php b/lib/Model/GetWhatsAppConfig.php
index 37b1719..6dc9c93 100644
--- a/lib/Model/GetWhatsAppConfig.php
+++ b/lib/Model/GetWhatsAppConfig.php
@@ -234,7 +234,7 @@ public function getPhoneNumberNameStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['whatsappBusinessAccountId'] = isset($data['whatsappBusinessAccountId']) ? $data['whatsappBusinessAccountId'] : null;
         $this->container['sendingLimit'] = isset($data['sendingLimit']) ? $data['sendingLimit'] : null;
diff --git a/lib/Model/GetWhatsappCampaignOverview.php b/lib/Model/GetWhatsappCampaignOverview.php
index 6d534b4..c9dc473 100644
--- a/lib/Model/GetWhatsappCampaignOverview.php
+++ b/lib/Model/GetWhatsappCampaignOverview.php
@@ -242,7 +242,7 @@ public function getCampaignStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['campaignName'] = isset($data['campaignName']) ? $data['campaignName'] : null;
diff --git a/lib/Model/GetWhatsappCampaigns.php b/lib/Model/GetWhatsappCampaigns.php
index 2534986..8abf1ab 100644
--- a/lib/Model/GetWhatsappCampaigns.php
+++ b/lib/Model/GetWhatsappCampaigns.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaigns'] = isset($data['campaigns']) ? $data['campaigns'] : null;
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
diff --git a/lib/Model/GetWhatsappCampaignsCampaigns.php b/lib/Model/GetWhatsappCampaignsCampaigns.php
index 32d2ceb..9686f19 100644
--- a/lib/Model/GetWhatsappCampaignsCampaigns.php
+++ b/lib/Model/GetWhatsappCampaignsCampaigns.php
@@ -252,7 +252,7 @@ public function getCampaignStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['campaignName'] = isset($data['campaignName']) ? $data['campaignName'] : null;
diff --git a/lib/Model/GetWhatsappEventReport.php b/lib/Model/GetWhatsappEventReport.php
index 1ebd730..b82fabe 100644
--- a/lib/Model/GetWhatsappEventReport.php
+++ b/lib/Model/GetWhatsappEventReport.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['events'] = isset($data['events']) ? $data['events'] : null;
     }
diff --git a/lib/Model/GetWhatsappEventReportEvents.php b/lib/Model/GetWhatsappEventReportEvents.php
index 8a45339..9ba42cb 100644
--- a/lib/Model/GetWhatsappEventReportEvents.php
+++ b/lib/Model/GetWhatsappEventReportEvents.php
@@ -235,7 +235,7 @@ public function getEventAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['contactNumber'] = isset($data['contactNumber']) ? $data['contactNumber'] : null;
         $this->container['date'] = isset($data['date']) ? $data['date'] : null;
diff --git a/lib/Model/InlineResponse200.php b/lib/Model/InlineResponse200.php
index 29347f6..9647e08 100644
--- a/lib/Model/InlineResponse200.php
+++ b/lib/Model/InlineResponse200.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['groupName'] = isset($data['groupName']) ? $data['groupName'] : null;
diff --git a/lib/Model/InlineResponse2001.php b/lib/Model/InlineResponse2001.php
index 4ffa18c..883ce9b 100644
--- a/lib/Model/InlineResponse2001.php
+++ b/lib/Model/InlineResponse2001.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InlineResponse2002.php b/lib/Model/InlineResponse2002.php
index 52f600e..ce7007f 100644
--- a/lib/Model/InlineResponse2002.php
+++ b/lib/Model/InlineResponse2002.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/InlineResponse201.php b/lib/Model/InlineResponse201.php
index 0c085bb..1cd46ce 100644
--- a/lib/Model/InlineResponse201.php
+++ b/lib/Model/InlineResponse201.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InlineResponse2011.php b/lib/Model/InlineResponse2011.php
index 78d2ddc..6615d33 100644
--- a/lib/Model/InlineResponse2011.php
+++ b/lib/Model/InlineResponse2011.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InlineResponse2012.php b/lib/Model/InlineResponse2012.php
index 8cc8472..6ba4a14 100644
--- a/lib/Model/InlineResponse2012.php
+++ b/lib/Model/InlineResponse2012.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InlineResponse2013.php b/lib/Model/InlineResponse2013.php
index 4ee7657..fbaa2ca 100644
--- a/lib/Model/InlineResponse2013.php
+++ b/lib/Model/InlineResponse2013.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InlineResponse2014.php b/lib/Model/InlineResponse2014.php
index d1cecdb..8fa2aad 100644
--- a/lib/Model/InlineResponse2014.php
+++ b/lib/Model/InlineResponse2014.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['messageId'] = isset($data['messageId']) ? $data['messageId'] : null;
     }
diff --git a/lib/Model/InlineResponse2015.php b/lib/Model/InlineResponse2015.php
index 65f1c00..cd941ca 100644
--- a/lib/Model/InlineResponse2015.php
+++ b/lib/Model/InlineResponse2015.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/InviteAdminUser.php b/lib/Model/InviteAdminUser.php
index 75dbb6b..4888a2e 100644
--- a/lib/Model/InviteAdminUser.php
+++ b/lib/Model/InviteAdminUser.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['allFeaturesAccess'] = isset($data['allFeaturesAccess']) ? $data['allFeaturesAccess'] : null;
diff --git a/lib/Model/InviteAdminUserPrivileges.php b/lib/Model/InviteAdminUserPrivileges.php
index 32b2f8c..f98e5bb 100644
--- a/lib/Model/InviteAdminUserPrivileges.php
+++ b/lib/Model/InviteAdminUserPrivileges.php
@@ -215,7 +215,7 @@ public function getPermissionsAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['feature'] = isset($data['feature']) ? $data['feature'] : null;
         $this->container['permissions'] = isset($data['permissions']) ? $data['permissions'] : null;
diff --git a/lib/Model/Inviteuser.php b/lib/Model/Inviteuser.php
index 88a888a..cee7af0 100644
--- a/lib/Model/Inviteuser.php
+++ b/lib/Model/Inviteuser.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['allFeaturesAccess'] = isset($data['allFeaturesAccess']) ? $data['allFeaturesAccess'] : null;
diff --git a/lib/Model/InviteuserPrivileges.php b/lib/Model/InviteuserPrivileges.php
index 5832ae9..ab7101a 100644
--- a/lib/Model/InviteuserPrivileges.php
+++ b/lib/Model/InviteuserPrivileges.php
@@ -287,7 +287,7 @@ public function getPermissionsAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['feature'] = isset($data['feature']) ? $data['feature'] : null;
         $this->container['permissions'] = isset($data['permissions']) ? $data['permissions'] : null;
diff --git a/lib/Model/ManageIp.php b/lib/Model/ManageIp.php
index d3c973c..6462d5e 100644
--- a/lib/Model/ManageIp.php
+++ b/lib/Model/ManageIp.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['ip'] = isset($data['ip']) ? $data['ip'] : null;
     }
diff --git a/lib/Model/MasterDetailsResponse.php b/lib/Model/MasterDetailsResponse.php
index 3b98206..3d36031 100644
--- a/lib/Model/MasterDetailsResponse.php
+++ b/lib/Model/MasterDetailsResponse.php
@@ -205,7 +205,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['companyName'] = isset($data['companyName']) ? $data['companyName'] : null;
diff --git a/lib/Model/MasterDetailsResponseBillingInfo.php b/lib/Model/MasterDetailsResponseBillingInfo.php
index 519790b..ac07dec 100644
--- a/lib/Model/MasterDetailsResponseBillingInfo.php
+++ b/lib/Model/MasterDetailsResponseBillingInfo.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['companyName'] = isset($data['companyName']) ? $data['companyName'] : null;
diff --git a/lib/Model/MasterDetailsResponseBillingInfoAddress.php b/lib/Model/MasterDetailsResponseBillingInfoAddress.php
index 0fd11cf..ff3595b 100644
--- a/lib/Model/MasterDetailsResponseBillingInfoAddress.php
+++ b/lib/Model/MasterDetailsResponseBillingInfoAddress.php
@@ -196,7 +196,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['streetAddress'] = isset($data['streetAddress']) ? $data['streetAddress'] : null;
         $this->container['locality'] = isset($data['locality']) ? $data['locality'] : null;
diff --git a/lib/Model/MasterDetailsResponseBillingInfoName.php b/lib/Model/MasterDetailsResponseBillingInfoName.php
index 9eaebdf..c563eb2 100644
--- a/lib/Model/MasterDetailsResponseBillingInfoName.php
+++ b/lib/Model/MasterDetailsResponseBillingInfoName.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['givenName'] = isset($data['givenName']) ? $data['givenName'] : null;
         $this->container['familyName'] = isset($data['familyName']) ? $data['familyName'] : null;
diff --git a/lib/Model/MasterDetailsResponsePlanInfo.php b/lib/Model/MasterDetailsResponsePlanInfo.php
index 366576b..35889b7 100644
--- a/lib/Model/MasterDetailsResponsePlanInfo.php
+++ b/lib/Model/MasterDetailsResponsePlanInfo.php
@@ -216,7 +216,7 @@ public function getPlanPeriodAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['currencyCode'] = isset($data['currencyCode']) ? $data['currencyCode'] : null;
         $this->container['nextBillingAt'] = isset($data['nextBillingAt']) ? $data['nextBillingAt'] : null;
diff --git a/lib/Model/MasterDetailsResponsePlanInfoFeatures.php b/lib/Model/MasterDetailsResponsePlanInfoFeatures.php
index cb40811..119baf5 100644
--- a/lib/Model/MasterDetailsResponsePlanInfoFeatures.php
+++ b/lib/Model/MasterDetailsResponsePlanInfoFeatures.php
@@ -205,7 +205,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['unitValue'] = isset($data['unitValue']) ? $data['unitValue'] : null;
diff --git a/lib/Model/Note.php b/lib/Model/Note.php
index 8b73bc0..31f16af 100644
--- a/lib/Model/Note.php
+++ b/lib/Model/Note.php
@@ -206,7 +206,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
diff --git a/lib/Model/NoteData.php b/lib/Model/NoteData.php
index 0b23fb0..1a8a0db 100644
--- a/lib/Model/NoteData.php
+++ b/lib/Model/NoteData.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
         $this->container['contactIds'] = isset($data['contactIds']) ? $data['contactIds'] : null;
diff --git a/lib/Model/NoteId.php b/lib/Model/NoteId.php
index 30d6181..9fc3478 100644
--- a/lib/Model/NoteId.php
+++ b/lib/Model/NoteId.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
     }
diff --git a/lib/Model/NoteList.php b/lib/Model/NoteList.php
index 93e4cad..bb1b293 100644
--- a/lib/Model/NoteList.php
+++ b/lib/Model/NoteList.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/Order.php b/lib/Model/Order.php
index 688f576..0271dd7 100644
--- a/lib/Model/Order.php
+++ b/lib/Model/Order.php
@@ -215,7 +215,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['createdAt'] = isset($data['createdAt']) ? $data['createdAt'] : null;
diff --git a/lib/Model/OrderBatch.php b/lib/Model/OrderBatch.php
index 98a9fed..fa4dc36 100644
--- a/lib/Model/OrderBatch.php
+++ b/lib/Model/OrderBatch.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['orders'] = isset($data['orders']) ? $data['orders'] : null;
         $this->container['notifyUrl'] = isset($data['notifyUrl']) ? $data['notifyUrl'] : null;
diff --git a/lib/Model/OrderBilling.php b/lib/Model/OrderBilling.php
index ded706a..1d82cb0 100644
--- a/lib/Model/OrderBilling.php
+++ b/lib/Model/OrderBilling.php
@@ -206,7 +206,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['address'] = isset($data['address']) ? $data['address'] : null;
         $this->container['city'] = isset($data['city']) ? $data['city'] : null;
diff --git a/lib/Model/OrderProducts.php b/lib/Model/OrderProducts.php
index 1a921c2..43b66a0 100644
--- a/lib/Model/OrderProducts.php
+++ b/lib/Model/OrderProducts.php
@@ -191,7 +191,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['productId'] = isset($data['productId']) ? $data['productId'] : null;
         $this->container['quantity'] = isset($data['quantity']) ? $data['quantity'] : null;
diff --git a/lib/Model/Otp.php b/lib/Model/Otp.php
index 89a28c0..86aa6f2 100644
--- a/lib/Model/Otp.php
+++ b/lib/Model/Otp.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
     }
diff --git a/lib/Model/Pipeline.php b/lib/Model/Pipeline.php
index 02ab62c..5959116 100644
--- a/lib/Model/Pipeline.php
+++ b/lib/Model/Pipeline.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['pipeline'] = isset($data['pipeline']) ? $data['pipeline'] : null;
         $this->container['pipelineName'] = isset($data['pipelineName']) ? $data['pipelineName'] : null;
diff --git a/lib/Model/PipelineStage.php b/lib/Model/PipelineStage.php
index cf6d2f8..158fb2f 100644
--- a/lib/Model/PipelineStage.php
+++ b/lib/Model/PipelineStage.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/Pipelines.php b/lib/Model/Pipelines.php
index c07200d..5cdf894 100644
--- a/lib/Model/Pipelines.php
+++ b/lib/Model/Pipelines.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
     }
 
diff --git a/lib/Model/PostContactInfo.php b/lib/Model/PostContactInfo.php
index 46d17d2..3f79f02 100644
--- a/lib/Model/PostContactInfo.php
+++ b/lib/Model/PostContactInfo.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['contacts'] = isset($data['contacts']) ? $data['contacts'] : null;
     }
diff --git a/lib/Model/PostContactInfoContacts.php b/lib/Model/PostContactInfoContacts.php
index 978c032..34c76fb 100644
--- a/lib/Model/PostContactInfoContacts.php
+++ b/lib/Model/PostContactInfoContacts.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['success'] = isset($data['success']) ? $data['success'] : null;
         $this->container['failure'] = isset($data['failure']) ? $data['failure'] : null;
diff --git a/lib/Model/PostSendFailed.php b/lib/Model/PostSendFailed.php
index 8c7567d..ed41bd3 100644
--- a/lib/Model/PostSendFailed.php
+++ b/lib/Model/PostSendFailed.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['code'] = isset($data['code']) ? $data['code'] : null;
         $this->container['message'] = isset($data['message']) ? $data['message'] : null;
diff --git a/lib/Model/PostSendSmsTestFailed.php b/lib/Model/PostSendSmsTestFailed.php
index a74ea9d..04dc73b 100644
--- a/lib/Model/PostSendSmsTestFailed.php
+++ b/lib/Model/PostSendSmsTestFailed.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['code'] = isset($data['code']) ? $data['code'] : null;
         $this->container['message'] = isset($data['message']) ? $data['message'] : null;
diff --git a/lib/Model/PutRevokeUserPermission.php b/lib/Model/PutRevokeUserPermission.php
index b527afd..3707f98 100644
--- a/lib/Model/PutRevokeUserPermission.php
+++ b/lib/Model/PutRevokeUserPermission.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
     }
diff --git a/lib/Model/Putresendcancelinvitation.php b/lib/Model/Putresendcancelinvitation.php
index ba77e8b..1920cd4 100644
--- a/lib/Model/Putresendcancelinvitation.php
+++ b/lib/Model/Putresendcancelinvitation.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
     }
diff --git a/lib/Model/RemainingCreditModel.php b/lib/Model/RemainingCreditModel.php
index 2502d8c..e97a304 100644
--- a/lib/Model/RemainingCreditModel.php
+++ b/lib/Model/RemainingCreditModel.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['child'] = isset($data['child']) ? $data['child'] : null;
         $this->container['reseller'] = isset($data['reseller']) ? $data['reseller'] : null;
diff --git a/lib/Model/RemainingCreditModelChild.php b/lib/Model/RemainingCreditModelChild.php
index 98b9769..df4fda6 100644
--- a/lib/Model/RemainingCreditModelChild.php
+++ b/lib/Model/RemainingCreditModelChild.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sms'] = isset($data['sms']) ? $data['sms'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/RemainingCreditModelReseller.php b/lib/Model/RemainingCreditModelReseller.php
index 288b708..a90f37a 100644
--- a/lib/Model/RemainingCreditModelReseller.php
+++ b/lib/Model/RemainingCreditModelReseller.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sms'] = isset($data['sms']) ? $data['sms'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/RemoveContactFromList.php b/lib/Model/RemoveContactFromList.php
index b253f36..46a7b0a 100644
--- a/lib/Model/RemoveContactFromList.php
+++ b/lib/Model/RemoveContactFromList.php
@@ -187,7 +187,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['emails'] = isset($data['emails']) ? $data['emails'] : null;
         $this->container['ids'] = isset($data['ids']) ? $data['ids'] : null;
diff --git a/lib/Model/RemoveCredits.php b/lib/Model/RemoveCredits.php
index a214ae6..5fe7a70 100644
--- a/lib/Model/RemoveCredits.php
+++ b/lib/Model/RemoveCredits.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sms'] = isset($data['sms']) ? $data['sms'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/RequestContactExport.php b/lib/Model/RequestContactExport.php
index 3fb1bd2..bff1ff4 100644
--- a/lib/Model/RequestContactExport.php
+++ b/lib/Model/RequestContactExport.php
@@ -202,7 +202,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['exportAttributes'] = isset($data['exportAttributes']) ? $data['exportAttributes'] : null;
         $this->container['customContactFilter'] = isset($data['customContactFilter']) ? $data['customContactFilter'] : null;
diff --git a/lib/Model/RequestContactExportCustomContactFilter.php b/lib/Model/RequestContactExportCustomContactFilter.php
index baf63ba..84dd939 100644
--- a/lib/Model/RequestContactExportCustomContactFilter.php
+++ b/lib/Model/RequestContactExportCustomContactFilter.php
@@ -262,7 +262,7 @@ public function getActionForSmsCampaignsAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['actionForContacts'] = isset($data['actionForContacts']) ? $data['actionForContacts'] : null;
         $this->container['actionForEmailCampaigns'] = isset($data['actionForEmailCampaigns']) ? $data['actionForEmailCampaigns'] : null;
diff --git a/lib/Model/RequestContactImport.php b/lib/Model/RequestContactImport.php
index 5c45bbe..2dd2ce7 100644
--- a/lib/Model/RequestContactImport.php
+++ b/lib/Model/RequestContactImport.php
@@ -222,7 +222,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['fileUrl'] = isset($data['fileUrl']) ? $data['fileUrl'] : null;
         $this->container['fileBody'] = isset($data['fileBody']) ? $data['fileBody'] : null;
diff --git a/lib/Model/RequestContactImportJsonBody.php b/lib/Model/RequestContactImportJsonBody.php
index dca681a..a01c890 100644
--- a/lib/Model/RequestContactImportJsonBody.php
+++ b/lib/Model/RequestContactImportJsonBody.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
diff --git a/lib/Model/RequestContactImportNewList.php b/lib/Model/RequestContactImportNewList.php
index 9b1ffe7..6ae273d 100644
--- a/lib/Model/RequestContactImportNewList.php
+++ b/lib/Model/RequestContactImportNewList.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['listName'] = isset($data['listName']) ? $data['listName'] : null;
         $this->container['folderId'] = isset($data['folderId']) ? $data['folderId'] : null;
diff --git a/lib/Model/RequestSmsRecipientExport.php b/lib/Model/RequestSmsRecipientExport.php
index c9a592c..c88a0c7 100644
--- a/lib/Model/RequestSmsRecipientExport.php
+++ b/lib/Model/RequestSmsRecipientExport.php
@@ -203,7 +203,7 @@ public function getRecipientsTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['notifyURL'] = isset($data['notifyURL']) ? $data['notifyURL'] : null;
         $this->container['recipientsType'] = isset($data['recipientsType']) ? $data['recipientsType'] : null;
diff --git a/lib/Model/ScheduleSmtpEmail.php b/lib/Model/ScheduleSmtpEmail.php
index e0f077c..1aa8bcf 100644
--- a/lib/Model/ScheduleSmtpEmail.php
+++ b/lib/Model/ScheduleSmtpEmail.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['messageId'] = isset($data['messageId']) ? $data['messageId'] : null;
         $this->container['messageIds'] = isset($data['messageIds']) ? $data['messageIds'] : null;
diff --git a/lib/Model/SendReport.php b/lib/Model/SendReport.php
index 84b0c60..f5901df 100644
--- a/lib/Model/SendReport.php
+++ b/lib/Model/SendReport.php
@@ -203,7 +203,7 @@ public function getLanguageAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['language'] = isset($data['language']) ? $data['language'] : 'fr';
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/SendReportEmail.php b/lib/Model/SendReportEmail.php
index a5aa068..f1fbd4a 100644
--- a/lib/Model/SendReportEmail.php
+++ b/lib/Model/SendReportEmail.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['to'] = isset($data['to']) ? $data['to'] : null;
         $this->container['body'] = isset($data['body']) ? $data['body'] : null;
diff --git a/lib/Model/SendSms.php b/lib/Model/SendSms.php
index 3d332aa..7476813 100644
--- a/lib/Model/SendSms.php
+++ b/lib/Model/SendSms.php
@@ -192,7 +192,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['reference'] = isset($data['reference']) ? $data['reference'] : null;
         $this->container['messageId'] = isset($data['messageId']) ? $data['messageId'] : null;
diff --git a/lib/Model/SendTestSms.php b/lib/Model/SendTestSms.php
index 7421b38..8fe3750 100644
--- a/lib/Model/SendTestSms.php
+++ b/lib/Model/SendTestSms.php
@@ -172,7 +172,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['phoneNumber'] = isset($data['phoneNumber']) ? $data['phoneNumber'] : null;
     }
diff --git a/lib/Model/SendTransacSms.php b/lib/Model/SendTransacSms.php
index bb848a8..98d1d07 100644
--- a/lib/Model/SendTransacSms.php
+++ b/lib/Model/SendTransacSms.php
@@ -221,7 +221,7 @@ public function getTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
         $this->container['recipient'] = isset($data['recipient']) ? $data['recipient'] : null;
diff --git a/lib/Model/SendTransacSmsTag.php b/lib/Model/SendTransacSmsTag.php
index 9503bb2..9c387d0 100644
--- a/lib/Model/SendTransacSmsTag.php
+++ b/lib/Model/SendTransacSmsTag.php
@@ -173,7 +173,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['field'] = isset($data['field']) ? $data['field'] : null;
     }
diff --git a/lib/Model/SendWhatsappMessage.php b/lib/Model/SendWhatsappMessage.php
index ecb3ce4..f39887e 100644
--- a/lib/Model/SendWhatsappMessage.php
+++ b/lib/Model/SendWhatsappMessage.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['templateId'] = isset($data['templateId']) ? $data['templateId'] : null;
         $this->container['text'] = isset($data['text']) ? $data['text'] : null;
diff --git a/lib/Model/SsoTokenRequest.php b/lib/Model/SsoTokenRequest.php
index b29cedc..93e505d 100644
--- a/lib/Model/SsoTokenRequest.php
+++ b/lib/Model/SsoTokenRequest.php
@@ -217,7 +217,7 @@ public function getTargetAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/SubAccountAppsToggleRequest.php b/lib/Model/SubAccountAppsToggleRequest.php
index f7b9392..6be70c6 100644
--- a/lib/Model/SubAccountAppsToggleRequest.php
+++ b/lib/Model/SubAccountAppsToggleRequest.php
@@ -236,7 +236,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['inbox'] = isset($data['inbox']) ? $data['inbox'] : null;
         $this->container['whatsapp'] = isset($data['whatsapp']) ? $data['whatsapp'] : null;
diff --git a/lib/Model/SubAccountDetailsResponse.php b/lib/Model/SubAccountDetailsResponse.php
index 0c1deca..843b87b 100644
--- a/lib/Model/SubAccountDetailsResponse.php
+++ b/lib/Model/SubAccountDetailsResponse.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfo.php b/lib/Model/SubAccountDetailsResponsePlanInfo.php
index 5283b78..ee124a9 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfo.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfo.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['credits'] = isset($data['credits']) ? $data['credits'] : null;
         $this->container['features'] = isset($data['features']) ? $data['features'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoCredits.php b/lib/Model/SubAccountDetailsResponsePlanInfoCredits.php
index 425dace..5d6ee51 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoCredits.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoCredits.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sms'] = isset($data['sms']) ? $data['sms'] : null;
         $this->container['emails'] = isset($data['emails']) ? $data['emails'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoCreditsEmails.php b/lib/Model/SubAccountDetailsResponsePlanInfoCreditsEmails.php
index dd1b582..765621f 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoCreditsEmails.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoCreditsEmails.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['quantity'] = isset($data['quantity']) ? $data['quantity'] : null;
         $this->container['remaining'] = isset($data['remaining']) ? $data['remaining'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoFeatures.php b/lib/Model/SubAccountDetailsResponsePlanInfoFeatures.php
index b79a45f..46f337c 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoFeatures.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoFeatures.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['inbox'] = isset($data['inbox']) ? $data['inbox'] : null;
         $this->container['landingPage'] = isset($data['landingPage']) ? $data['landingPage'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesInbox.php b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesInbox.php
index 76e2f65..67f8693 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesInbox.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesInbox.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['quantity'] = isset($data['quantity']) ? $data['quantity'] : null;
         $this->container['remaining'] = isset($data['remaining']) ? $data['remaining'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesLandingPage.php b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesLandingPage.php
index 3bce42d..c52056c 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesLandingPage.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesLandingPage.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['quantity'] = isset($data['quantity']) ? $data['quantity'] : null;
         $this->container['remaining'] = isset($data['remaining']) ? $data['remaining'] : null;
diff --git a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesUsers.php b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesUsers.php
index 3700796..f7006d4 100644
--- a/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesUsers.php
+++ b/lib/Model/SubAccountDetailsResponsePlanInfoFeaturesUsers.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['quantity'] = isset($data['quantity']) ? $data['quantity'] : null;
         $this->container['remaining'] = isset($data['remaining']) ? $data['remaining'] : null;
diff --git a/lib/Model/SubAccountUpdatePlanRequest.php b/lib/Model/SubAccountUpdatePlanRequest.php
index 385a1f0..68e44e2 100644
--- a/lib/Model/SubAccountUpdatePlanRequest.php
+++ b/lib/Model/SubAccountUpdatePlanRequest.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['credits'] = isset($data['credits']) ? $data['credits'] : null;
         $this->container['features'] = isset($data['features']) ? $data['features'] : null;
diff --git a/lib/Model/SubAccountUpdatePlanRequestCredits.php b/lib/Model/SubAccountUpdatePlanRequestCredits.php
index c116f68..69193c0 100644
--- a/lib/Model/SubAccountUpdatePlanRequestCredits.php
+++ b/lib/Model/SubAccountUpdatePlanRequestCredits.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
     }
diff --git a/lib/Model/SubAccountUpdatePlanRequestFeatures.php b/lib/Model/SubAccountUpdatePlanRequestFeatures.php
index d0d20fb..fd199ae 100644
--- a/lib/Model/SubAccountUpdatePlanRequestFeatures.php
+++ b/lib/Model/SubAccountUpdatePlanRequestFeatures.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['users'] = isset($data['users']) ? $data['users'] : null;
         $this->container['landingPage'] = isset($data['landingPage']) ? $data['landingPage'] : null;
diff --git a/lib/Model/SubAccountsResponse.php b/lib/Model/SubAccountsResponse.php
index 6f6e088..cf39cd9 100644
--- a/lib/Model/SubAccountsResponse.php
+++ b/lib/Model/SubAccountsResponse.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['count'] = isset($data['count']) ? $data['count'] : null;
         $this->container['subAccounts'] = isset($data['subAccounts']) ? $data['subAccounts'] : null;
diff --git a/lib/Model/SubAccountsResponseSubAccounts.php b/lib/Model/SubAccountsResponseSubAccounts.php
index 1641dfa..5dfd4a9 100644
--- a/lib/Model/SubAccountsResponseSubAccounts.php
+++ b/lib/Model/SubAccountsResponseSubAccounts.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['companyName'] = isset($data['companyName']) ? $data['companyName'] : null;
diff --git a/lib/Model/Task.php b/lib/Model/Task.php
index 08d27b3..f5b7c29 100644
--- a/lib/Model/Task.php
+++ b/lib/Model/Task.php
@@ -201,7 +201,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['taskTypeId'] = isset($data['taskTypeId']) ? $data['taskTypeId'] : null;
diff --git a/lib/Model/TaskList.php b/lib/Model/TaskList.php
index 51115b6..4ea4d6a 100644
--- a/lib/Model/TaskList.php
+++ b/lib/Model/TaskList.php
@@ -176,7 +176,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['items'] = isset($data['items']) ? $data['items'] : null;
     }
diff --git a/lib/Model/TaskReminder.php b/lib/Model/TaskReminder.php
index fb84ad0..8410e7d 100644
--- a/lib/Model/TaskReminder.php
+++ b/lib/Model/TaskReminder.php
@@ -205,7 +205,7 @@ public function getUnitAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['unit'] = isset($data['unit']) ? $data['unit'] : null;
diff --git a/lib/Model/TaskTypes.php b/lib/Model/TaskTypes.php
index 305351e..6d0579c 100644
--- a/lib/Model/TaskTypes.php
+++ b/lib/Model/TaskTypes.php
@@ -181,7 +181,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
         $this->container['title'] = isset($data['title']) ? $data['title'] : null;
diff --git a/lib/Model/UpdateAttribute.php b/lib/Model/UpdateAttribute.php
index 010877e..5e2f4c5 100644
--- a/lib/Model/UpdateAttribute.php
+++ b/lib/Model/UpdateAttribute.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['enumeration'] = isset($data['enumeration']) ? $data['enumeration'] : null;
diff --git a/lib/Model/UpdateAttributeEnumeration.php b/lib/Model/UpdateAttributeEnumeration.php
index 81d9b66..818b55b 100644
--- a/lib/Model/UpdateAttributeEnumeration.php
+++ b/lib/Model/UpdateAttributeEnumeration.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['value'] = isset($data['value']) ? $data['value'] : null;
         $this->container['label'] = isset($data['label']) ? $data['label'] : null;
diff --git a/lib/Model/UpdateBatchContacts.php b/lib/Model/UpdateBatchContacts.php
index f922dd7..2a4afb8 100644
--- a/lib/Model/UpdateBatchContacts.php
+++ b/lib/Model/UpdateBatchContacts.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['contacts'] = isset($data['contacts']) ? $data['contacts'] : null;
     }
diff --git a/lib/Model/UpdateBatchContactsContacts.php b/lib/Model/UpdateBatchContactsContacts.php
index 5de1c5c..89dac51 100644
--- a/lib/Model/UpdateBatchContactsContacts.php
+++ b/lib/Model/UpdateBatchContactsContacts.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['id'] = isset($data['id']) ? $data['id'] : null;
diff --git a/lib/Model/UpdateBatchContactsModel.php b/lib/Model/UpdateBatchContactsModel.php
index afe0a6d..ef11731 100644
--- a/lib/Model/UpdateBatchContactsModel.php
+++ b/lib/Model/UpdateBatchContactsModel.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['successIds'] = isset($data['successIds']) ? $data['successIds'] : null;
         $this->container['failureIds'] = isset($data['failureIds']) ? $data['failureIds'] : null;
diff --git a/lib/Model/UpdateCampaignStatus.php b/lib/Model/UpdateCampaignStatus.php
index 98aa902..25c87d1 100644
--- a/lib/Model/UpdateCampaignStatus.php
+++ b/lib/Model/UpdateCampaignStatus.php
@@ -203,7 +203,7 @@ public function getStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['status'] = isset($data['status']) ? $data['status'] : null;
     }
diff --git a/lib/Model/UpdateChild.php b/lib/Model/UpdateChild.php
index ddcb0d2..7fa566c 100644
--- a/lib/Model/UpdateChild.php
+++ b/lib/Model/UpdateChild.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
         $this->container['firstName'] = isset($data['firstName']) ? $data['firstName'] : null;
diff --git a/lib/Model/UpdateChildAccountStatus.php b/lib/Model/UpdateChildAccountStatus.php
index 6fc4ce2..cf71032 100644
--- a/lib/Model/UpdateChildAccountStatus.php
+++ b/lib/Model/UpdateChildAccountStatus.php
@@ -190,7 +190,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['transactionalEmail'] = isset($data['transactionalEmail']) ? $data['transactionalEmail'] : null;
         $this->container['transactionalSms'] = isset($data['transactionalSms']) ? $data['transactionalSms'] : null;
diff --git a/lib/Model/UpdateChildDomain.php b/lib/Model/UpdateChildDomain.php
index db4d98b..5dce141 100644
--- a/lib/Model/UpdateChildDomain.php
+++ b/lib/Model/UpdateChildDomain.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['domain'] = isset($data['domain']) ? $data['domain'] : null;
     }
diff --git a/lib/Model/UpdateContact.php b/lib/Model/UpdateContact.php
index 9431618..543d074 100644
--- a/lib/Model/UpdateContact.php
+++ b/lib/Model/UpdateContact.php
@@ -202,7 +202,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['attributes'] = isset($data['attributes']) ? $data['attributes'] : null;
         $this->container['extId'] = isset($data['extId']) ? $data['extId'] : null;
diff --git a/lib/Model/UpdateCouponCollection.php b/lib/Model/UpdateCouponCollection.php
index fe6b87c..2728f36 100644
--- a/lib/Model/UpdateCouponCollection.php
+++ b/lib/Model/UpdateCouponCollection.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['defaultCoupon'] = isset($data['defaultCoupon']) ? $data['defaultCoupon'] : null;
     }
diff --git a/lib/Model/UpdateEmailCampaign.php b/lib/Model/UpdateEmailCampaign.php
index 0fc74b8..e05162b 100644
--- a/lib/Model/UpdateEmailCampaign.php
+++ b/lib/Model/UpdateEmailCampaign.php
@@ -340,7 +340,7 @@ public function getWinnerCriteriaAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['tag'] = isset($data['tag']) ? $data['tag'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/UpdateEmailCampaignRecipients.php b/lib/Model/UpdateEmailCampaignRecipients.php
index 11e1e8a..922dbae 100644
--- a/lib/Model/UpdateEmailCampaignRecipients.php
+++ b/lib/Model/UpdateEmailCampaignRecipients.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['exclusionListIds'] = isset($data['exclusionListIds']) ? $data['exclusionListIds'] : null;
         $this->container['listIds'] = isset($data['listIds']) ? $data['listIds'] : null;
diff --git a/lib/Model/UpdateEmailCampaignSender.php b/lib/Model/UpdateEmailCampaignSender.php
index a0e3f2d..338be46 100644
--- a/lib/Model/UpdateEmailCampaignSender.php
+++ b/lib/Model/UpdateEmailCampaignSender.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/UpdateExternalFeed.php b/lib/Model/UpdateExternalFeed.php
index f6034cc..79cf53c 100644
--- a/lib/Model/UpdateExternalFeed.php
+++ b/lib/Model/UpdateExternalFeed.php
@@ -232,7 +232,7 @@ public function getAuthTypeAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
diff --git a/lib/Model/UpdateList.php b/lib/Model/UpdateList.php
index 076cbe5..7a61fb1 100644
--- a/lib/Model/UpdateList.php
+++ b/lib/Model/UpdateList.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['folderId'] = isset($data['folderId']) ? $data['folderId'] : null;
diff --git a/lib/Model/UpdateSender.php b/lib/Model/UpdateSender.php
index 7f5548a..d95c9e5 100644
--- a/lib/Model/UpdateSender.php
+++ b/lib/Model/UpdateSender.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/UpdateSmsCampaign.php b/lib/Model/UpdateSmsCampaign.php
index b7eea8a..291d896 100644
--- a/lib/Model/UpdateSmsCampaign.php
+++ b/lib/Model/UpdateSmsCampaign.php
@@ -210,7 +210,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/UpdateSmtpTemplate.php b/lib/Model/UpdateSmtpTemplate.php
index a9d6dba..5ddcaf6 100644
--- a/lib/Model/UpdateSmtpTemplate.php
+++ b/lib/Model/UpdateSmtpTemplate.php
@@ -220,7 +220,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['tag'] = isset($data['tag']) ? $data['tag'] : null;
         $this->container['sender'] = isset($data['sender']) ? $data['sender'] : null;
diff --git a/lib/Model/UpdateSmtpTemplateSender.php b/lib/Model/UpdateSmtpTemplateSender.php
index 6997349..b9b198e 100644
--- a/lib/Model/UpdateSmtpTemplateSender.php
+++ b/lib/Model/UpdateSmtpTemplateSender.php
@@ -186,7 +186,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['email'] = isset($data['email']) ? $data['email'] : null;
diff --git a/lib/Model/UpdateWebhook.php b/lib/Model/UpdateWebhook.php
index 6b8d016..dc409c0 100644
--- a/lib/Model/UpdateWebhook.php
+++ b/lib/Model/UpdateWebhook.php
@@ -250,7 +250,7 @@ public function getEventsAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
         $this->container['description'] = isset($data['description']) ? $data['description'] : null;
diff --git a/lib/Model/UpdateWhatsAppCampaign.php b/lib/Model/UpdateWhatsAppCampaign.php
index 20a4879..94896b7 100644
--- a/lib/Model/UpdateWhatsAppCampaign.php
+++ b/lib/Model/UpdateWhatsAppCampaign.php
@@ -205,7 +205,7 @@ public function getCampaignStatusAllowableValues()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['campaignName'] = isset($data['campaignName']) ? $data['campaignName'] : null;
         $this->container['campaignStatus'] = isset($data['campaignStatus']) ? $data['campaignStatus'] : 'scheduled';
diff --git a/lib/Model/UploadImageModel.php b/lib/Model/UploadImageModel.php
index 7285b8f..3529ab6 100644
--- a/lib/Model/UploadImageModel.php
+++ b/lib/Model/UploadImageModel.php
@@ -175,7 +175,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['url'] = isset($data['url']) ? $data['url'] : null;
     }
diff --git a/lib/Model/UploadImageToGallery.php b/lib/Model/UploadImageToGallery.php
index 7510add..3582f1f 100644
--- a/lib/Model/UploadImageToGallery.php
+++ b/lib/Model/UploadImageToGallery.php
@@ -180,7 +180,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['imageUrl'] = isset($data['imageUrl']) ? $data['imageUrl'] : null;
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
diff --git a/lib/Model/VariablesItems.php b/lib/Model/VariablesItems.php
index e6c6864..703d526 100644
--- a/lib/Model/VariablesItems.php
+++ b/lib/Model/VariablesItems.php
@@ -185,7 +185,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['default'] = isset($data['default']) ? $data['default'] : null;
diff --git a/lib/Model/WhatsappCampStats.php b/lib/Model/WhatsappCampStats.php
index 8aacad6..4cc86e0 100644
--- a/lib/Model/WhatsappCampStats.php
+++ b/lib/Model/WhatsappCampStats.php
@@ -195,7 +195,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['sent'] = isset($data['sent']) ? $data['sent'] : null;
         $this->container['delivered'] = isset($data['delivered']) ? $data['delivered'] : null;
diff --git a/lib/Model/WhatsappCampTemplate.php b/lib/Model/WhatsappCampTemplate.php
index 21e1005..7fc858d 100644
--- a/lib/Model/WhatsappCampTemplate.php
+++ b/lib/Model/WhatsappCampTemplate.php
@@ -225,7 +225,7 @@ public function getModelName()
      * @param mixed[] $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         $this->container['name'] = isset($data['name']) ? $data['name'] : null;
         $this->container['category'] = isset($data['category']) ? $data['category'] : null;