diff --git a/.gitignore b/.gitignore
index 5962a54..30a1e63 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .*.swp
 /vendor/
 /composer.lock
+.idea
\ No newline at end of file
diff --git a/lib/Model/AccountInfo.php b/lib/Model/AccountInfo.php
index 9a22989..40cedcc 100644
--- a/lib/Model/AccountInfo.php
+++ b/lib/Model/AccountInfo.php
@@ -142,9 +142,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AccountInfo to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/AccountParameter.php b/lib/Model/AccountParameter.php
index 7feb0fe..b80ced1 100644
--- a/lib/Model/AccountParameter.php
+++ b/lib/Model/AccountParameter.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AccountParameter to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->key)) {
             $result["key"] = strval($this->key);
diff --git a/lib/Model/AddItemsResult.php b/lib/Model/AddItemsResult.php
index fe49b8b..ce7a6fc 100644
--- a/lib/Model/AddItemsResult.php
+++ b/lib/Model/AddItemsResult.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddItemsResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ids)) {
             $result["ids"] = $this->ids;
diff --git a/lib/Model/AddPayments.php b/lib/Model/AddPayments.php
index db2472c..a1f3fae 100644
--- a/lib/Model/AddPayments.php
+++ b/lib/Model/AddPayments.php
@@ -103,9 +103,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddPayments to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/AddProducts.php b/lib/Model/AddProducts.php
index ba32938..0aaf35d 100644
--- a/lib/Model/AddProducts.php
+++ b/lib/Model/AddProducts.php
@@ -79,9 +79,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddProducts to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->products)) {
             $result["products"] = $this->products;
diff --git a/lib/Model/AddRefunds.php b/lib/Model/AddRefunds.php
index cf0c1ab..6938994 100644
--- a/lib/Model/AddRefunds.php
+++ b/lib/Model/AddRefunds.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddRefunds to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/AddTickets.php b/lib/Model/AddTickets.php
index 555f360..8f1b81a 100644
--- a/lib/Model/AddTickets.php
+++ b/lib/Model/AddTickets.php
@@ -89,9 +89,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->onlysinglerow)) {
             $result["onlysinglerow"] = (bool)$this->onlysinglerow;
diff --git a/lib/Model/AddVoucherCodes.php b/lib/Model/AddVoucherCodes.php
index ece9e64..5b6b3af 100644
--- a/lib/Model/AddVoucherCodes.php
+++ b/lib/Model/AddVoucherCodes.php
@@ -103,9 +103,9 @@ public static function fromJson($obj) {
     /**
      * Serialize AddVoucherCodes to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/Address.php b/lib/Model/Address.php
index a24f517..56ab1cf 100644
--- a/lib/Model/Address.php
+++ b/lib/Model/Address.php
@@ -187,9 +187,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Address to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/Appoptin.php b/lib/Model/Appoptin.php
index d83a745..534794f 100644
--- a/lib/Model/Appoptin.php
+++ b/lib/Model/Appoptin.php
@@ -110,9 +110,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Appoptin to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ip)) {
             $result["ip"] = strval($this->ip);
diff --git a/lib/Model/BatchContactOperation.php b/lib/Model/BatchContactOperation.php
index 3db42be..d672802 100644
--- a/lib/Model/BatchContactOperation.php
+++ b/lib/Model/BatchContactOperation.php
@@ -96,9 +96,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchContactOperation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ids)) {
             $result["ids"] = $this->ids;
diff --git a/lib/Model/BatchContactParameters.php b/lib/Model/BatchContactParameters.php
index 6e8e877..dfb6992 100644
--- a/lib/Model/BatchContactParameters.php
+++ b/lib/Model/BatchContactParameters.php
@@ -112,9 +112,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchContactParameters to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->name)) {
             $result["name"] = strval($this->name);
diff --git a/lib/Model/BatchContactUpdateField.php b/lib/Model/BatchContactUpdateField.php
index 16ed7a5..32c661a 100644
--- a/lib/Model/BatchContactUpdateField.php
+++ b/lib/Model/BatchContactUpdateField.php
@@ -96,9 +96,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchContactUpdateField to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->key)) {
             $result["key"] = strval($this->key);
diff --git a/lib/Model/BatchEventOperation.php b/lib/Model/BatchEventOperation.php
index 0f6d048..6116c98 100644
--- a/lib/Model/BatchEventOperation.php
+++ b/lib/Model/BatchEventOperation.php
@@ -96,9 +96,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchEventOperation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ids)) {
             $result["ids"] = $this->ids;
diff --git a/lib/Model/BatchEventParameters.php b/lib/Model/BatchEventParameters.php
index 54d0ecd..d5ffd25 100644
--- a/lib/Model/BatchEventParameters.php
+++ b/lib/Model/BatchEventParameters.php
@@ -79,9 +79,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchEventParameters to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->updatefields)) {
             $result["updatefields"] = $this->updatefields;
diff --git a/lib/Model/BatchEventUpdateField.php b/lib/Model/BatchEventUpdateField.php
index b1d872b..cb67403 100644
--- a/lib/Model/BatchEventUpdateField.php
+++ b/lib/Model/BatchEventUpdateField.php
@@ -97,9 +97,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchEventUpdateField to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->key)) {
             $result["key"] = strval($this->key);
diff --git a/lib/Model/BatchOrderOperation.php b/lib/Model/BatchOrderOperation.php
index 3715e75..46d485b 100644
--- a/lib/Model/BatchOrderOperation.php
+++ b/lib/Model/BatchOrderOperation.php
@@ -95,9 +95,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchOrderOperation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ids)) {
             $result["ids"] = $this->ids;
diff --git a/lib/Model/BatchOrderParameters.php b/lib/Model/BatchOrderParameters.php
index e500142..59249fe 100644
--- a/lib/Model/BatchOrderParameters.php
+++ b/lib/Model/BatchOrderParameters.php
@@ -79,9 +79,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchOrderParameters to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->updatefields)) {
             $result["updatefields"] = $this->updatefields;
diff --git a/lib/Model/BatchOrderUpdateField.php b/lib/Model/BatchOrderUpdateField.php
index 82a0022..81af30c 100644
--- a/lib/Model/BatchOrderUpdateField.php
+++ b/lib/Model/BatchOrderUpdateField.php
@@ -96,9 +96,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchOrderUpdateField to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->key)) {
             $result["key"] = strval($this->key);
diff --git a/lib/Model/BatchResult.php b/lib/Model/BatchResult.php
index d545f03..82ea613 100644
--- a/lib/Model/BatchResult.php
+++ b/lib/Model/BatchResult.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->nbrsucceeded)) {
             $result["nbrsucceeded"] = intval($this->nbrsucceeded);
diff --git a/lib/Model/BatchResultItem.php b/lib/Model/BatchResultItem.php
index 3e00cbf..e167212 100644
--- a/lib/Model/BatchResultItem.php
+++ b/lib/Model/BatchResultItem.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize BatchResultItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/Contact.php b/lib/Model/Contact.php
index da6e803..3e0207e 100644
--- a/lib/Model/Contact.php
+++ b/lib/Model/Contact.php
@@ -360,9 +360,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Contact to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactAddressType.php b/lib/Model/ContactAddressType.php
index 7f44418..d20dc1a 100644
--- a/lib/Model/ContactAddressType.php
+++ b/lib/Model/ContactAddressType.php
@@ -130,9 +130,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactAddressType to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactAddressTypeQuery.php b/lib/Model/ContactAddressTypeQuery.php
index daf2961..15e99ba 100644
--- a/lib/Model/ContactAddressTypeQuery.php
+++ b/lib/Model/ContactAddressTypeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactAddressTypeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/ContactBatchUpdate.php b/lib/Model/ContactBatchUpdate.php
index 3b953d2..7392b07 100644
--- a/lib/Model/ContactBatchUpdate.php
+++ b/lib/Model/ContactBatchUpdate.php
@@ -103,9 +103,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactBatchUpdate to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->customertitleid)) {
             $result["customertitleid"] = intval($this->customertitleid);
diff --git a/lib/Model/ContactField.php b/lib/Model/ContactField.php
index c24c4d6..c2b1369 100644
--- a/lib/Model/ContactField.php
+++ b/lib/Model/ContactField.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactField to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactGetQuery.php b/lib/Model/ContactGetQuery.php
index 89fdf87..c0c31a7 100644
--- a/lib/Model/ContactGetQuery.php
+++ b/lib/Model/ContactGetQuery.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactGetQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->email)) {
             $result["email"] = strval($this->email);
diff --git a/lib/Model/ContactIdReservation.php b/lib/Model/ContactIdReservation.php
index 3d87162..ce19da7 100644
--- a/lib/Model/ContactIdReservation.php
+++ b/lib/Model/ContactIdReservation.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactIdReservation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactImportStatus.php b/lib/Model/ContactImportStatus.php
index e722c2a..0b33125 100644
--- a/lib/Model/ContactImportStatus.php
+++ b/lib/Model/ContactImportStatus.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactImportStatus to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactOptIn.php b/lib/Model/ContactOptIn.php
index 047c1ea..f3a2dc9 100644
--- a/lib/Model/ContactOptIn.php
+++ b/lib/Model/ContactOptIn.php
@@ -119,9 +119,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactOptIn to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactOptInInfo.php b/lib/Model/ContactOptInInfo.php
index b88d4a8..ccc595e 100644
--- a/lib/Model/ContactOptInInfo.php
+++ b/lib/Model/ContactOptInInfo.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactOptInInfo to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ip)) {
             $result["ip"] = strval($this->ip);
diff --git a/lib/Model/ContactQuery.php b/lib/Model/ContactQuery.php
index 1925b7f..493c505 100644
--- a/lib/Model/ContactQuery.php
+++ b/lib/Model/ContactQuery.php
@@ -150,9 +150,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/ContactRelationship.php b/lib/Model/ContactRelationship.php
index 7c9692f..563458c 100644
--- a/lib/Model/ContactRelationship.php
+++ b/lib/Model/ContactRelationship.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactRelationship to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactRemark.php b/lib/Model/ContactRemark.php
index 1cab8f7..d65e412 100644
--- a/lib/Model/ContactRemark.php
+++ b/lib/Model/ContactRemark.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactRemark to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactTitle.php b/lib/Model/ContactTitle.php
index 6d1f43c..afda2ef 100644
--- a/lib/Model/ContactTitle.php
+++ b/lib/Model/ContactTitle.php
@@ -153,9 +153,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactTitle to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ContactTitleQuery.php b/lib/Model/ContactTitleQuery.php
index ebb0e36..3a2d101 100644
--- a/lib/Model/ContactTitleQuery.php
+++ b/lib/Model/ContactTitleQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ContactTitleQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/CreateOrder.php b/lib/Model/CreateOrder.php
index 96496e7..8b3dfe9 100644
--- a/lib/Model/CreateOrder.php
+++ b/lib/Model/CreateOrder.php
@@ -96,9 +96,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CreateOrder to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->events)) {
             $result["events"] = $this->events;
diff --git a/lib/Model/CreateProduct.php b/lib/Model/CreateProduct.php
index 9d14669..e8faadb 100644
--- a/lib/Model/CreateProduct.php
+++ b/lib/Model/CreateProduct.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CreateProduct to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->productid)) {
             $result["productid"] = intval($this->productid);
diff --git a/lib/Model/CreateTicket.php b/lib/Model/CreateTicket.php
index b4f46f1..f63542c 100644
--- a/lib/Model/CreateTicket.php
+++ b/lib/Model/CreateTicket.php
@@ -113,9 +113,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CreateTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->optionbundleid)) {
             $result["optionbundleid"] = intval($this->optionbundleid);
diff --git a/lib/Model/CustomField.php b/lib/Model/CustomField.php
index eb336c9..7dddce4 100644
--- a/lib/Model/CustomField.php
+++ b/lib/Model/CustomField.php
@@ -200,9 +200,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CustomField to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/CustomFieldQuery.php b/lib/Model/CustomFieldQuery.php
index 3e94322..486278e 100644
--- a/lib/Model/CustomFieldQuery.php
+++ b/lib/Model/CustomFieldQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CustomFieldQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/CustomFieldValue.php b/lib/Model/CustomFieldValue.php
index 3e54af5..db1cb00 100644
--- a/lib/Model/CustomFieldValue.php
+++ b/lib/Model/CustomFieldValue.php
@@ -147,9 +147,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CustomFieldValue to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/CustomFieldValueQuery.php b/lib/Model/CustomFieldValueQuery.php
index f9dc854..63d4197 100644
--- a/lib/Model/CustomFieldValueQuery.php
+++ b/lib/Model/CustomFieldValueQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CustomFieldValueQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/CustomfieldAvailability.php b/lib/Model/CustomfieldAvailability.php
index f0ea6b9..83bf2a6 100644
--- a/lib/Model/CustomfieldAvailability.php
+++ b/lib/Model/CustomfieldAvailability.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize CustomfieldAvailability to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannels)) {
             $result["saleschannels"] = $this->saleschannels;
diff --git a/lib/Model/DeleteProducts.php b/lib/Model/DeleteProducts.php
index 6ccc9df..66258b3 100644
--- a/lib/Model/DeleteProducts.php
+++ b/lib/Model/DeleteProducts.php
@@ -79,9 +79,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DeleteProducts to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->products)) {
             $result["products"] = $this->products;
diff --git a/lib/Model/DeleteTickets.php b/lib/Model/DeleteTickets.php
index 5c2016d..e447c73 100644
--- a/lib/Model/DeleteTickets.php
+++ b/lib/Model/DeleteTickets.php
@@ -79,9 +79,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DeleteTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->tickets)) {
             $result["tickets"] = $this->tickets;
diff --git a/lib/Model/DeliveryScenario.php b/lib/Model/DeliveryScenario.php
index 0621f7c..4215869 100644
--- a/lib/Model/DeliveryScenario.php
+++ b/lib/Model/DeliveryScenario.php
@@ -262,9 +262,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DeliveryScenario to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/DeliveryScenarioQuery.php b/lib/Model/DeliveryScenarioQuery.php
index 50838d9..5ba2693 100644
--- a/lib/Model/DeliveryScenarioQuery.php
+++ b/lib/Model/DeliveryScenarioQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DeliveryScenarioQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/DeliveryscenarioAvailability.php b/lib/Model/DeliveryscenarioAvailability.php
index 28a3cf6..44276cf 100644
--- a/lib/Model/DeliveryscenarioAvailability.php
+++ b/lib/Model/DeliveryscenarioAvailability.php
@@ -156,9 +156,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DeliveryscenarioAvailability to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannels)) {
             $result["saleschannels"] = $this->saleschannels;
diff --git a/lib/Model/Document.php b/lib/Model/Document.php
index 28d890e..325ebf1 100644
--- a/lib/Model/Document.php
+++ b/lib/Model/Document.php
@@ -184,9 +184,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Document to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/DocumentOptions.php b/lib/Model/DocumentOptions.php
index 19af522..3e9515e 100644
--- a/lib/Model/DocumentOptions.php
+++ b/lib/Model/DocumentOptions.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DocumentOptions to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->nbrperpage)) {
             $result["nbrperpage"] = intval($this->nbrperpage);
diff --git a/lib/Model/DocumentQuery.php b/lib/Model/DocumentQuery.php
index a5c6932..89b0533 100644
--- a/lib/Model/DocumentQuery.php
+++ b/lib/Model/DocumentQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DocumentQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/DupeDetectCriteria.php b/lib/Model/DupeDetectCriteria.php
index cda987c..c19b0f2 100644
--- a/lib/Model/DupeDetectCriteria.php
+++ b/lib/Model/DupeDetectCriteria.php
@@ -88,9 +88,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DupeDetectCriteria to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->field)) {
             $result["field"] = strval($this->field);
diff --git a/lib/Model/DupeDetectRule.php b/lib/Model/DupeDetectRule.php
index f31a4a6..2cd0c29 100644
--- a/lib/Model/DupeDetectRule.php
+++ b/lib/Model/DupeDetectRule.php
@@ -127,9 +127,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DupeDetectRule to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/DupeDetectRuleQuery.php b/lib/Model/DupeDetectRuleQuery.php
index 0b23604..733aaaf 100644
--- a/lib/Model/DupeDetectRuleQuery.php
+++ b/lib/Model/DupeDetectRuleQuery.php
@@ -92,9 +92,9 @@ public static function fromJson($obj) {
     /**
      * Serialize DupeDetectRuleQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/Event.php b/lib/Model/Event.php
index 5009ad2..3d691b7 100644
--- a/lib/Model/Event.php
+++ b/lib/Model/Event.php
@@ -613,9 +613,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Event to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventContext.php b/lib/Model/EventContext.php
index 00c3962..4ba3519 100644
--- a/lib/Model/EventContext.php
+++ b/lib/Model/EventContext.php
@@ -84,9 +84,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventContext to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannelid)) {
             $result["saleschannelid"] = intval($this->saleschannelid);
diff --git a/lib/Model/EventContingent.php b/lib/Model/EventContingent.php
index 9c8a58c..2e1c908 100644
--- a/lib/Model/EventContingent.php
+++ b/lib/Model/EventContingent.php
@@ -138,9 +138,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventContingent to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventContingentAvailability.php b/lib/Model/EventContingentAvailability.php
index b33d780..f51375d 100644
--- a/lib/Model/EventContingentAvailability.php
+++ b/lib/Model/EventContingentAvailability.php
@@ -150,9 +150,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventContingentAvailability to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->complimentary)) {
             $result["complimentary"] = intval($this->complimentary);
diff --git a/lib/Model/EventContingentLock.php b/lib/Model/EventContingentLock.php
index 1f7fd2c..2512f56 100644
--- a/lib/Model/EventContingentLock.php
+++ b/lib/Model/EventContingentLock.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventContingentLock to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = intval($this->amount);
diff --git a/lib/Model/EventFilter.php b/lib/Model/EventFilter.php
index 6d1be18..0b1cbc7 100644
--- a/lib/Model/EventFilter.php
+++ b/lib/Model/EventFilter.php
@@ -89,9 +89,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventFilter to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->productionid)) {
             $result["productionid"] = intval($this->productionid);
diff --git a/lib/Model/EventLocation.php b/lib/Model/EventLocation.php
index 3a54c3e..e9a1172 100644
--- a/lib/Model/EventLocation.php
+++ b/lib/Model/EventLocation.php
@@ -236,9 +236,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventLocation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventLocationQuery.php b/lib/Model/EventLocationQuery.php
index 241ade5..ef08e9e 100644
--- a/lib/Model/EventLocationQuery.php
+++ b/lib/Model/EventLocationQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventLocationQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/EventLockTickets.php b/lib/Model/EventLockTickets.php
index b90a933..2b2cca1 100644
--- a/lib/Model/EventLockTickets.php
+++ b/lib/Model/EventLockTickets.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventLockTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->locktypeid)) {
             $result["locktypeid"] = intval($this->locktypeid);
diff --git a/lib/Model/EventPreview.php b/lib/Model/EventPreview.php
index bffd9e3..3b7abee 100644
--- a/lib/Model/EventPreview.php
+++ b/lib/Model/EventPreview.php
@@ -119,9 +119,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPreview to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->linkurl)) {
             $result["linkurl"] = strval($this->linkurl);
diff --git a/lib/Model/EventPrices.php b/lib/Model/EventPrices.php
index 02fd45f..217b35d 100644
--- a/lib/Model/EventPrices.php
+++ b/lib/Model/EventPrices.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPrices to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->contingents)) {
             $result["contingents"] = $this->contingents;
diff --git a/lib/Model/EventPricesContingent.php b/lib/Model/EventPricesContingent.php
index 19b7895..c4b362c 100644
--- a/lib/Model/EventPricesContingent.php
+++ b/lib/Model/EventPricesContingent.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPricesContingent to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->contingentid)) {
             $result["contingentid"] = intval($this->contingentid);
diff --git a/lib/Model/EventPricesCost.php b/lib/Model/EventPricesCost.php
index 3e02be5..37e11cb 100644
--- a/lib/Model/EventPricesCost.php
+++ b/lib/Model/EventPricesCost.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPricesCost to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->cost)) {
             $result["cost"] = floatval($this->cost);
diff --git a/lib/Model/EventPricesPricetype.php b/lib/Model/EventPricesPricetype.php
index 2a3a351..6af76dc 100644
--- a/lib/Model/EventPricesPricetype.php
+++ b/lib/Model/EventPricesPricetype.php
@@ -95,9 +95,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPricesPricetype to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->pricetypeid)) {
             $result["pricetypeid"] = intval($this->pricetypeid);
diff --git a/lib/Model/EventPricesSaleschannel.php b/lib/Model/EventPricesSaleschannel.php
index 82d649b..5315f6e 100644
--- a/lib/Model/EventPricesSaleschannel.php
+++ b/lib/Model/EventPricesSaleschannel.php
@@ -120,9 +120,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventPricesSaleschannel to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->conditions)) {
             $result["conditions"] = $this->conditions;
diff --git a/lib/Model/EventQuery.php b/lib/Model/EventQuery.php
index f34ee73..5922008 100644
--- a/lib/Model/EventQuery.php
+++ b/lib/Model/EventQuery.php
@@ -165,9 +165,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->context)) {
             $result["context"] = $this->context;
diff --git a/lib/Model/EventSalesChannel.php b/lib/Model/EventSalesChannel.php
index 1fa3778..8e28462 100644
--- a/lib/Model/EventSalesChannel.php
+++ b/lib/Model/EventSalesChannel.php
@@ -119,9 +119,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventSalesChannel to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->eventid)) {
             $result["eventid"] = intval($this->eventid);
diff --git a/lib/Model/EventScanTicketsOut.php b/lib/Model/EventScanTicketsOut.php
index 93b9f1a..acfa734 100644
--- a/lib/Model/EventScanTicketsOut.php
+++ b/lib/Model/EventScanTicketsOut.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventScanTicketsOut to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->tickettypeids)) {
             $result["tickettypeids"] = $this->tickettypeids;
diff --git a/lib/Model/EventSeatingplanContingent.php b/lib/Model/EventSeatingplanContingent.php
index 13f1f6a..cceac34 100644
--- a/lib/Model/EventSeatingplanContingent.php
+++ b/lib/Model/EventSeatingplanContingent.php
@@ -111,9 +111,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventSeatingplanContingent to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventTicket.php b/lib/Model/EventTicket.php
index 82af719..8148105 100644
--- a/lib/Model/EventTicket.php
+++ b/lib/Model/EventTicket.php
@@ -379,9 +379,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventTicketFilter.php b/lib/Model/EventTicketFilter.php
index f960c78..adb9d75 100644
--- a/lib/Model/EventTicketFilter.php
+++ b/lib/Model/EventTicketFilter.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventTicketFilter to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->tickettypeid)) {
             $result["tickettypeid"] = intval($this->tickettypeid);
diff --git a/lib/Model/EventTicketQuery.php b/lib/Model/EventTicketQuery.php
index 6b0ffe6..aa30223 100644
--- a/lib/Model/EventTicketQuery.php
+++ b/lib/Model/EventTicketQuery.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventTicketQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->simplefilter)) {
             $result["simplefilter"] = $this->simplefilter;
diff --git a/lib/Model/EventUnlockTickets.php b/lib/Model/EventUnlockTickets.php
index 36ec79b..a6410dd 100644
--- a/lib/Model/EventUnlockTickets.php
+++ b/lib/Model/EventUnlockTickets.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventUnlockTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->ticketids)) {
             $result["ticketids"] = $this->ticketids;
diff --git a/lib/Model/EventUpdateSeatRankForTickets.php b/lib/Model/EventUpdateSeatRankForTickets.php
index cf0dfe8..31bd397 100644
--- a/lib/Model/EventUpdateSeatRankForTickets.php
+++ b/lib/Model/EventUpdateSeatRankForTickets.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventUpdateSeatRankForTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->seatrankid)) {
             $result["seatrankid"] = intval($this->seatrankid);
diff --git a/lib/Model/EventUpsellitem.php b/lib/Model/EventUpsellitem.php
index fd8527c..ec64d3e 100644
--- a/lib/Model/EventUpsellitem.php
+++ b/lib/Model/EventUpsellitem.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventUpsellitem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/EventstreamItem.php b/lib/Model/EventstreamItem.php
index 46ffd1a..448e3a6 100644
--- a/lib/Model/EventstreamItem.php
+++ b/lib/Model/EventstreamItem.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventstreamItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = strval($this->id);
diff --git a/lib/Model/EventstreamRequest.php b/lib/Model/EventstreamRequest.php
index f900543..6cf8714 100644
--- a/lib/Model/EventstreamRequest.php
+++ b/lib/Model/EventstreamRequest.php
@@ -95,9 +95,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventstreamRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = strval($this->id);
diff --git a/lib/Model/EventstreamResult.php b/lib/Model/EventstreamResult.php
index 0735a06..8bae468 100644
--- a/lib/Model/EventstreamResult.php
+++ b/lib/Model/EventstreamResult.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize EventstreamResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->moreresults)) {
             $result["moreresults"] = (bool)$this->moreresults;
diff --git a/lib/Model/FieldDefinition.php b/lib/Model/FieldDefinition.php
index b580c35..f02741b 100644
--- a/lib/Model/FieldDefinition.php
+++ b/lib/Model/FieldDefinition.php
@@ -192,9 +192,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FieldDefinition to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/FieldDefinitionQuery.php b/lib/Model/FieldDefinitionQuery.php
index 43622a7..07d61c6 100644
--- a/lib/Model/FieldDefinitionQuery.php
+++ b/lib/Model/FieldDefinitionQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FieldDefinitionQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/FielddefinitionsDataRequest.php b/lib/Model/FielddefinitionsDataRequest.php
index 9927f0f..c021363 100644
--- a/lib/Model/FielddefinitionsDataRequest.php
+++ b/lib/Model/FielddefinitionsDataRequest.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FielddefinitionsDataRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/FielddefinitionsDataResult.php b/lib/Model/FielddefinitionsDataResult.php
index 50edda3..566474d 100644
--- a/lib/Model/FielddefinitionsDataResult.php
+++ b/lib/Model/FielddefinitionsDataResult.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FielddefinitionsDataResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/FilterDefinition.php b/lib/Model/FilterDefinition.php
index ed0e509..d22d958 100644
--- a/lib/Model/FilterDefinition.php
+++ b/lib/Model/FilterDefinition.php
@@ -174,9 +174,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FilterDefinition to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/FilterDefinitionQuery.php b/lib/Model/FilterDefinitionQuery.php
index 4832ea3..caef955 100644
--- a/lib/Model/FilterDefinitionQuery.php
+++ b/lib/Model/FilterDefinitionQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FilterDefinitionQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/FilterItem.php b/lib/Model/FilterItem.php
index 25cb11b..e7119e4 100644
--- a/lib/Model/FilterItem.php
+++ b/lib/Model/FilterItem.php
@@ -88,9 +88,9 @@ public static function fromJson($obj) {
     /**
      * Serialize FilterItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/Flowinfo.php b/lib/Model/Flowinfo.php
index 7793587..71b78ea 100644
--- a/lib/Model/Flowinfo.php
+++ b/lib/Model/Flowinfo.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Flowinfo to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->contactid)) {
             $result["contactid"] = intval($this->contactid);
diff --git a/lib/Model/Flowsession.php b/lib/Model/Flowsession.php
index 78777d7..0e55bc3 100644
--- a/lib/Model/Flowsession.php
+++ b/lib/Model/Flowsession.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Flowsession to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->orderid)) {
             $result["orderid"] = intval($this->orderid);
diff --git a/lib/Model/ImportBundleTicket.php b/lib/Model/ImportBundleTicket.php
index 30fbbcb..2ac86f7 100644
--- a/lib/Model/ImportBundleTicket.php
+++ b/lib/Model/ImportBundleTicket.php
@@ -124,9 +124,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportBundleTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ImportOrder.php b/lib/Model/ImportOrder.php
index a17addb..d506b31 100644
--- a/lib/Model/ImportOrder.php
+++ b/lib/Model/ImportOrder.php
@@ -246,9 +246,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportOrder to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->orderid)) {
             $result["orderid"] = intval($this->orderid);
diff --git a/lib/Model/ImportOrdercost.php b/lib/Model/ImportOrdercost.php
index 918c186..f10818c 100644
--- a/lib/Model/ImportOrdercost.php
+++ b/lib/Model/ImportOrdercost.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportOrdercost to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/ImportPayment.php b/lib/Model/ImportPayment.php
index 7e3c7cd..9670f83 100644
--- a/lib/Model/ImportPayment.php
+++ b/lib/Model/ImportPayment.php
@@ -118,9 +118,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportPayment to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/ImportProduct.php b/lib/Model/ImportProduct.php
index 1c0cf7b..7fe7976 100644
--- a/lib/Model/ImportProduct.php
+++ b/lib/Model/ImportProduct.php
@@ -148,9 +148,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportProduct to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->bundletickets)) {
             $result["bundletickets"] = $this->bundletickets;
diff --git a/lib/Model/ImportTicket.php b/lib/Model/ImportTicket.php
index b772be9..0910638 100644
--- a/lib/Model/ImportTicket.php
+++ b/lib/Model/ImportTicket.php
@@ -169,9 +169,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ImportTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/JobResult.php b/lib/Model/JobResult.php
index 98bb065..b417b7b 100644
--- a/lib/Model/JobResult.php
+++ b/lib/Model/JobResult.php
@@ -110,9 +110,9 @@ public static function fromJson($obj) {
     /**
      * Serialize JobResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = strval($this->id);
diff --git a/lib/Model/KeyValueItem.php b/lib/Model/KeyValueItem.php
index 7c382a1..58b296f 100644
--- a/lib/Model/KeyValueItem.php
+++ b/lib/Model/KeyValueItem.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize KeyValueItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->key)) {
             $result["key"] = strval($this->key);
diff --git a/lib/Model/Layout.php b/lib/Model/Layout.php
index cd7f9b3..54872cd 100644
--- a/lib/Model/Layout.php
+++ b/lib/Model/Layout.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Layout to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->color)) {
             $result["color"] = strval($this->color);
diff --git a/lib/Model/LockTemplate.php b/lib/Model/LockTemplate.php
index 676d812..213e267 100644
--- a/lib/Model/LockTemplate.php
+++ b/lib/Model/LockTemplate.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LockTemplate to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->name)) {
             $result["name"] = strval($this->name);
diff --git a/lib/Model/LockType.php b/lib/Model/LockType.php
index 3e578ce..d19a401 100644
--- a/lib/Model/LockType.php
+++ b/lib/Model/LockType.php
@@ -154,9 +154,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LockType to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/LockTypeQuery.php b/lib/Model/LockTypeQuery.php
index 08a335a..f8baf62 100644
--- a/lib/Model/LockTypeQuery.php
+++ b/lib/Model/LockTypeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LockTypeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/LogItem.php b/lib/Model/LogItem.php
index 2608ae5..0de751f 100644
--- a/lib/Model/LogItem.php
+++ b/lib/Model/LogItem.php
@@ -204,9 +204,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LogItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/LogicalPlan.php b/lib/Model/LogicalPlan.php
index db61b7e..282d336 100644
--- a/lib/Model/LogicalPlan.php
+++ b/lib/Model/LogicalPlan.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LogicalPlan to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/LogicalPlanRow.php b/lib/Model/LogicalPlanRow.php
index da9a45d..d4fff27 100644
--- a/lib/Model/LogicalPlanRow.php
+++ b/lib/Model/LogicalPlanRow.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LogicalPlanRow to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->name)) {
             $result["name"] = strval($this->name);
diff --git a/lib/Model/LogicalPlanSeat.php b/lib/Model/LogicalPlanSeat.php
index 6beefd2..09c3021 100644
--- a/lib/Model/LogicalPlanSeat.php
+++ b/lib/Model/LogicalPlanSeat.php
@@ -142,9 +142,9 @@ public static function fromJson($obj) {
     /**
      * Serialize LogicalPlanSeat to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = strval($this->id);
diff --git a/lib/Model/OptIn.php b/lib/Model/OptIn.php
index 1b03a8b..e5d9bbd 100644
--- a/lib/Model/OptIn.php
+++ b/lib/Model/OptIn.php
@@ -177,9 +177,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OptIn to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OptInAvailability.php b/lib/Model/OptInAvailability.php
index a800587..4c6276d 100644
--- a/lib/Model/OptInAvailability.php
+++ b/lib/Model/OptInAvailability.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OptInAvailability to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannelid)) {
             $result["saleschannelid"] = intval($this->saleschannelid);
diff --git a/lib/Model/OptInQuery.php b/lib/Model/OptInQuery.php
index da57ca9..6518adb 100644
--- a/lib/Model/OptInQuery.php
+++ b/lib/Model/OptInQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OptInQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/Order.php b/lib/Model/Order.php
index d72d480..d0a53e1 100644
--- a/lib/Model/Order.php
+++ b/lib/Model/Order.php
@@ -418,9 +418,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Order to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->orderid)) {
             $result["orderid"] = intval($this->orderid);
diff --git a/lib/Model/OrderFee.php b/lib/Model/OrderFee.php
index 07de28c..213e437 100644
--- a/lib/Model/OrderFee.php
+++ b/lib/Model/OrderFee.php
@@ -161,9 +161,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderFee to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderFeeDefinition.php b/lib/Model/OrderFeeDefinition.php
index 4938672..34638e4 100644
--- a/lib/Model/OrderFeeDefinition.php
+++ b/lib/Model/OrderFeeDefinition.php
@@ -162,9 +162,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderFeeDefinition to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderFeeDefinitionQuery.php b/lib/Model/OrderFeeDefinitionQuery.php
index 93e7c64..de13d33 100644
--- a/lib/Model/OrderFeeDefinitionQuery.php
+++ b/lib/Model/OrderFeeDefinitionQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderFeeDefinitionQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/OrderFeeQuery.php b/lib/Model/OrderFeeQuery.php
index 9267c04..1b6b222 100644
--- a/lib/Model/OrderFeeQuery.php
+++ b/lib/Model/OrderFeeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderFeeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/OrderFilter.php b/lib/Model/OrderFilter.php
index 9c5c952..01212d2 100644
--- a/lib/Model/OrderFilter.php
+++ b/lib/Model/OrderFilter.php
@@ -112,9 +112,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderFilter to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->createdsince)) {
             $result["createdsince"] = Json::packTimestamp($this->createdsince);
diff --git a/lib/Model/OrderIdReservation.php b/lib/Model/OrderIdReservation.php
index 493d08a..edded4e 100644
--- a/lib/Model/OrderIdReservation.php
+++ b/lib/Model/OrderIdReservation.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderIdReservation to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderImportStatus.php b/lib/Model/OrderImportStatus.php
index ec67092..86cc0b1 100644
--- a/lib/Model/OrderImportStatus.php
+++ b/lib/Model/OrderImportStatus.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderImportStatus to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderMailTemplate.php b/lib/Model/OrderMailTemplate.php
index 93eb3dd..d1bef2b 100644
--- a/lib/Model/OrderMailTemplate.php
+++ b/lib/Model/OrderMailTemplate.php
@@ -172,9 +172,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderMailTemplate to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderMailTemplateQuery.php b/lib/Model/OrderMailTemplateQuery.php
index dac752a..d84ae49 100644
--- a/lib/Model/OrderMailTemplateQuery.php
+++ b/lib/Model/OrderMailTemplateQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderMailTemplateQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/OrderProduct.php b/lib/Model/OrderProduct.php
index 1e0f304..e33a865 100644
--- a/lib/Model/OrderProduct.php
+++ b/lib/Model/OrderProduct.php
@@ -151,9 +151,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderProduct to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderQuery.php b/lib/Model/OrderQuery.php
index c64b0df..3853c69 100644
--- a/lib/Model/OrderQuery.php
+++ b/lib/Model/OrderQuery.php
@@ -170,9 +170,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/OrderTicket.php b/lib/Model/OrderTicket.php
index 87f9da4..a41a97f 100644
--- a/lib/Model/OrderTicket.php
+++ b/lib/Model/OrderTicket.php
@@ -262,9 +262,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/OrderTickettype.php b/lib/Model/OrderTickettype.php
index f84c47b..1e6c949 100644
--- a/lib/Model/OrderTickettype.php
+++ b/lib/Model/OrderTickettype.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderTickettype to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/Ordercost.php b/lib/Model/Ordercost.php
index 8ecb4e7..e818c6d 100644
--- a/lib/Model/Ordercost.php
+++ b/lib/Model/Ordercost.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Ordercost to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->orderid)) {
             $result["orderid"] = intval($this->orderid);
diff --git a/lib/Model/OrderfeeAutoRule.php b/lib/Model/OrderfeeAutoRule.php
index 92b4d43..67277af 100644
--- a/lib/Model/OrderfeeAutoRule.php
+++ b/lib/Model/OrderfeeAutoRule.php
@@ -117,9 +117,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderfeeAutoRule to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->deliveryscenarioids)) {
             $result["deliveryscenarioids"] = $this->deliveryscenarioids;
diff --git a/lib/Model/OrderfeeRule.php b/lib/Model/OrderfeeRule.php
index 07cefd3..8e36d47 100644
--- a/lib/Model/OrderfeeRule.php
+++ b/lib/Model/OrderfeeRule.php
@@ -98,9 +98,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderfeeRule to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->auto)) {
             $result["auto"] = $this->auto;
diff --git a/lib/Model/OrderfeeScriptContext.php b/lib/Model/OrderfeeScriptContext.php
index 1c920fe..0f05716 100644
--- a/lib/Model/OrderfeeScriptContext.php
+++ b/lib/Model/OrderfeeScriptContext.php
@@ -97,9 +97,9 @@ public static function fromJson($obj) {
     /**
      * Serialize OrderfeeScriptContext to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->cacheable)) {
             $result["cacheable"] = (bool)$this->cacheable;
diff --git a/lib/Model/Payment.php b/lib/Model/Payment.php
index 0c7cceb..4615060 100644
--- a/lib/Model/Payment.php
+++ b/lib/Model/Payment.php
@@ -136,9 +136,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Payment to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PaymentMethod.php b/lib/Model/PaymentMethod.php
index fc28e64..4e07aa3 100644
--- a/lib/Model/PaymentMethod.php
+++ b/lib/Model/PaymentMethod.php
@@ -182,9 +182,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentMethod to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PaymentMethodQuery.php b/lib/Model/PaymentMethodQuery.php
index 84043ee..2ce0825 100644
--- a/lib/Model/PaymentMethodQuery.php
+++ b/lib/Model/PaymentMethodQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentMethodQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/PaymentRequest.php b/lib/Model/PaymentRequest.php
index 5cf7fca..c19c93b 100644
--- a/lib/Model/PaymentRequest.php
+++ b/lib/Model/PaymentRequest.php
@@ -95,9 +95,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->language)) {
             $result["language"] = strval($this->language);
diff --git a/lib/Model/PaymentScenario.php b/lib/Model/PaymentScenario.php
index bd6d6a2..ae3d762 100644
--- a/lib/Model/PaymentScenario.php
+++ b/lib/Model/PaymentScenario.php
@@ -302,9 +302,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentScenario to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PaymentScenarioQuery.php b/lib/Model/PaymentScenarioQuery.php
index d048872..f557500 100644
--- a/lib/Model/PaymentScenarioQuery.php
+++ b/lib/Model/PaymentScenarioQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentScenarioQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/PaymentscenarioAvailability.php b/lib/Model/PaymentscenarioAvailability.php
index a0f7483..f5d8e53 100644
--- a/lib/Model/PaymentscenarioAvailability.php
+++ b/lib/Model/PaymentscenarioAvailability.php
@@ -103,9 +103,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentscenarioAvailability to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannels)) {
             $result["saleschannels"] = $this->saleschannels;
diff --git a/lib/Model/PaymentscenarioExpiryParameters.php b/lib/Model/PaymentscenarioExpiryParameters.php
index d5dab22..c9a958d 100644
--- a/lib/Model/PaymentscenarioExpiryParameters.php
+++ b/lib/Model/PaymentscenarioExpiryParameters.php
@@ -111,9 +111,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentscenarioExpiryParameters to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->daysaftercreation)) {
             $result["daysaftercreation"] = intval($this->daysaftercreation);
diff --git a/lib/Model/PaymentscenarioOverdueParameters.php b/lib/Model/PaymentscenarioOverdueParameters.php
index d83aca0..61436b1 100644
--- a/lib/Model/PaymentscenarioOverdueParameters.php
+++ b/lib/Model/PaymentscenarioOverdueParameters.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PaymentscenarioOverdueParameters to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->daysaftercreation)) {
             $result["daysaftercreation"] = intval($this->daysaftercreation);
diff --git a/lib/Model/PhoneNumberType.php b/lib/Model/PhoneNumberType.php
index 4dfc2c6..2ed123e 100644
--- a/lib/Model/PhoneNumberType.php
+++ b/lib/Model/PhoneNumberType.php
@@ -129,9 +129,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PhoneNumberType to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PhoneNumberTypeQuery.php b/lib/Model/PhoneNumberTypeQuery.php
index c9882cf..c128552 100644
--- a/lib/Model/PhoneNumberTypeQuery.php
+++ b/lib/Model/PhoneNumberTypeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PhoneNumberTypeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/Phonenumber.php b/lib/Model/Phonenumber.php
index 35a752b..86f2688 100644
--- a/lib/Model/Phonenumber.php
+++ b/lib/Model/Phonenumber.php
@@ -110,9 +110,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Phonenumber to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PriceList.php b/lib/Model/PriceList.php
index eef32da..d617224 100644
--- a/lib/Model/PriceList.php
+++ b/lib/Model/PriceList.php
@@ -147,9 +147,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PriceList to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PriceListQuery.php b/lib/Model/PriceListQuery.php
index fa7ccda..467ec31 100644
--- a/lib/Model/PriceListQuery.php
+++ b/lib/Model/PriceListQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PriceListQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/PriceType.php b/lib/Model/PriceType.php
index 25c9072..ceb9e9a 100644
--- a/lib/Model/PriceType.php
+++ b/lib/Model/PriceType.php
@@ -164,9 +164,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PriceType to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/PriceTypeQuery.php b/lib/Model/PriceTypeQuery.php
index 04fd572..2a60a92 100644
--- a/lib/Model/PriceTypeQuery.php
+++ b/lib/Model/PriceTypeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PriceTypeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/PricelistPrice.php b/lib/Model/PricelistPrice.php
index 39556f5..92c0d63 100644
--- a/lib/Model/PricelistPrice.php
+++ b/lib/Model/PricelistPrice.php
@@ -124,9 +124,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PricelistPrice to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->availabilities)) {
             $result["availabilities"] = $this->availabilities;
diff --git a/lib/Model/PricelistPriceCondition.php b/lib/Model/PricelistPriceCondition.php
index 817b477..2b433dd 100644
--- a/lib/Model/PricelistPriceCondition.php
+++ b/lib/Model/PricelistPriceCondition.php
@@ -172,9 +172,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PricelistPriceCondition to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->type)) {
             $result["type"] = strval($this->type);
diff --git a/lib/Model/PricelistPrices.php b/lib/Model/PricelistPrices.php
index b90fe2e..266e781 100644
--- a/lib/Model/PricelistPrices.php
+++ b/lib/Model/PricelistPrices.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PricelistPrices to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->prices)) {
             $result["prices"] = $this->prices;
diff --git a/lib/Model/Product.php b/lib/Model/Product.php
index b23680f..3ae57fa 100644
--- a/lib/Model/Product.php
+++ b/lib/Model/Product.php
@@ -330,9 +330,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Product to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ProductCategory.php b/lib/Model/ProductCategory.php
index 805d944..8ec74b8 100644
--- a/lib/Model/ProductCategory.php
+++ b/lib/Model/ProductCategory.php
@@ -153,9 +153,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductCategory to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ProductCategoryQuery.php b/lib/Model/ProductCategoryQuery.php
index 18d2fae..1da7db1 100644
--- a/lib/Model/ProductCategoryQuery.php
+++ b/lib/Model/ProductCategoryQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductCategoryQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/ProductInstanceException.php b/lib/Model/ProductInstanceException.php
index f4971a1..dd348d8 100644
--- a/lib/Model/ProductInstanceException.php
+++ b/lib/Model/ProductInstanceException.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductInstanceException to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->properties)) {
             $result["properties"] = $this->properties;
diff --git a/lib/Model/ProductInstancePricetypeValue.php b/lib/Model/ProductInstancePricetypeValue.php
index bea8991..96fcd94 100644
--- a/lib/Model/ProductInstancePricetypeValue.php
+++ b/lib/Model/ProductInstancePricetypeValue.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductInstancePricetypeValue to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ProductInstanceValue.php b/lib/Model/ProductInstanceValue.php
index d7b9950..15ccf85 100644
--- a/lib/Model/ProductInstanceValue.php
+++ b/lib/Model/ProductInstanceValue.php
@@ -127,9 +127,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductInstanceValue to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->max_price)) {
             $result["max_price"] = floatval($this->max_price);
diff --git a/lib/Model/ProductInstancevalues.php b/lib/Model/ProductInstancevalues.php
index aecdeec..eb690a0 100644
--- a/lib/Model/ProductInstancevalues.php
+++ b/lib/Model/ProductInstancevalues.php
@@ -89,9 +89,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductInstancevalues to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->default)) {
             $result["default"] = $this->default;
diff --git a/lib/Model/ProductProperty.php b/lib/Model/ProductProperty.php
index 0ae662c..a48e987 100644
--- a/lib/Model/ProductProperty.php
+++ b/lib/Model/ProductProperty.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductProperty to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->name)) {
             $result["name"] = strval($this->name);
diff --git a/lib/Model/ProductQuery.php b/lib/Model/ProductQuery.php
index 9904f32..aab4c60 100644
--- a/lib/Model/ProductQuery.php
+++ b/lib/Model/ProductQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/ProductVoucherValue.php b/lib/Model/ProductVoucherValue.php
index 29698b8..12a5954 100644
--- a/lib/Model/ProductVoucherValue.php
+++ b/lib/Model/ProductVoucherValue.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ProductVoucherValue to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/PurgeOrdersRequest.php b/lib/Model/PurgeOrdersRequest.php
index 959da83..6e21b86 100644
--- a/lib/Model/PurgeOrdersRequest.php
+++ b/lib/Model/PurgeOrdersRequest.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize PurgeOrdersRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->contacts)) {
             $result["contacts"] = (bool)$this->contacts;
diff --git a/lib/Model/QueryRequest.php b/lib/Model/QueryRequest.php
index 104cd7c..c7f0400 100644
--- a/lib/Model/QueryRequest.php
+++ b/lib/Model/QueryRequest.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize QueryRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->limit)) {
             $result["limit"] = intval($this->limit);
diff --git a/lib/Model/QueryResult.php b/lib/Model/QueryResult.php
index 8a7cf6b..b0a0a9e 100644
--- a/lib/Model/QueryResult.php
+++ b/lib/Model/QueryResult.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize QueryResult to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->nbrofresults)) {
             $result["nbrofresults"] = intval($this->nbrofresults);
diff --git a/lib/Model/RelationType.php b/lib/Model/RelationType.php
index bd737b2..4d48901 100644
--- a/lib/Model/RelationType.php
+++ b/lib/Model/RelationType.php
@@ -137,9 +137,9 @@ public static function fromJson($obj) {
     /**
      * Serialize RelationType to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/RelationTypeQuery.php b/lib/Model/RelationTypeQuery.php
index c4fcf7e..82b9528 100644
--- a/lib/Model/RelationTypeQuery.php
+++ b/lib/Model/RelationTypeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize RelationTypeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/Report.php b/lib/Model/Report.php
index 4a950a4..7db051f 100644
--- a/lib/Model/Report.php
+++ b/lib/Model/Report.php
@@ -259,9 +259,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Report to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ReportOptions.php b/lib/Model/ReportOptions.php
index f5aac6f..73f3c54 100644
--- a/lib/Model/ReportOptions.php
+++ b/lib/Model/ReportOptions.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ReportOptions to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->excelpagewidth)) {
             $result["excelpagewidth"] = intval($this->excelpagewidth);
diff --git a/lib/Model/ReportQuery.php b/lib/Model/ReportQuery.php
index 6359ea4..4db2530 100644
--- a/lib/Model/ReportQuery.php
+++ b/lib/Model/ReportQuery.php
@@ -92,9 +92,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ReportQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/SalesChannel.php b/lib/Model/SalesChannel.php
index 6d24808..7ad83a0 100644
--- a/lib/Model/SalesChannel.php
+++ b/lib/Model/SalesChannel.php
@@ -156,9 +156,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SalesChannel to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/SalesChannelQuery.php b/lib/Model/SalesChannelQuery.php
index ad2e9a6..706876c 100644
--- a/lib/Model/SalesChannelQuery.php
+++ b/lib/Model/SalesChannelQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SalesChannelQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/SeatDescriptionTemplate.php b/lib/Model/SeatDescriptionTemplate.php
index 675c294..e8a3749 100644
--- a/lib/Model/SeatDescriptionTemplate.php
+++ b/lib/Model/SeatDescriptionTemplate.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SeatDescriptionTemplate to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/SeatRank.php b/lib/Model/SeatRank.php
index 417ebc1..804ab93 100644
--- a/lib/Model/SeatRank.php
+++ b/lib/Model/SeatRank.php
@@ -147,9 +147,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SeatRank to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/SeatRankQuery.php b/lib/Model/SeatRankQuery.php
index e064029..00abff5 100644
--- a/lib/Model/SeatRankQuery.php
+++ b/lib/Model/SeatRankQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SeatRankQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/SeatingPlan.php b/lib/Model/SeatingPlan.php
index 10b3f9e..438d475 100644
--- a/lib/Model/SeatingPlan.php
+++ b/lib/Model/SeatingPlan.php
@@ -169,9 +169,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SeatingPlan to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/SeatingPlanQuery.php b/lib/Model/SeatingPlanQuery.php
index 2ccb6bf..4d17f7f 100644
--- a/lib/Model/SeatingPlanQuery.php
+++ b/lib/Model/SeatingPlanQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SeatingPlanQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/ServicemailScheduling.php b/lib/Model/ServicemailScheduling.php
index 1d49803..7550a37 100644
--- a/lib/Model/ServicemailScheduling.php
+++ b/lib/Model/ServicemailScheduling.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ServicemailScheduling to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->days)) {
             $result["days"] = intval($this->days);
diff --git a/lib/Model/SetOrderCost.php b/lib/Model/SetOrderCost.php
index 47a0e64..3105767 100644
--- a/lib/Model/SetOrderCost.php
+++ b/lib/Model/SetOrderCost.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SetOrderCost to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->amount)) {
             $result["amount"] = floatval($this->amount);
diff --git a/lib/Model/SplitOrder.php b/lib/Model/SplitOrder.php
index c500afa..aef7f9a 100644
--- a/lib/Model/SplitOrder.php
+++ b/lib/Model/SplitOrder.php
@@ -121,9 +121,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SplitOrder to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->customerid)) {
             $result["customerid"] = intval($this->customerid);
diff --git a/lib/Model/SubscriberCommunication.php b/lib/Model/SubscriberCommunication.php
index 4a3df11..3e35bcb 100644
--- a/lib/Model/SubscriberCommunication.php
+++ b/lib/Model/SubscriberCommunication.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SubscriberCommunication to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->name)) {
             $result["name"] = strval($this->name);
diff --git a/lib/Model/SubscriberSync.php b/lib/Model/SubscriberSync.php
index cd938d6..74f77b4 100644
--- a/lib/Model/SubscriberSync.php
+++ b/lib/Model/SubscriberSync.php
@@ -113,9 +113,9 @@ public static function fromJson($obj) {
     /**
      * Serialize SubscriberSync to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->email)) {
             $result["email"] = strval($this->email);
diff --git a/lib/Model/TicketFee.php b/lib/Model/TicketFee.php
index 1ab9c6a..fd5da47 100644
--- a/lib/Model/TicketFee.php
+++ b/lib/Model/TicketFee.php
@@ -139,9 +139,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketFee to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/TicketFeeQuery.php b/lib/Model/TicketFeeQuery.php
index e4e05f0..a52e9b8 100644
--- a/lib/Model/TicketFeeQuery.php
+++ b/lib/Model/TicketFeeQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketFeeQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/TicketLayout.php b/lib/Model/TicketLayout.php
index 3f4c858..8b62b87 100644
--- a/lib/Model/TicketLayout.php
+++ b/lib/Model/TicketLayout.php
@@ -140,9 +140,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketLayout to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/TicketLayoutQuery.php b/lib/Model/TicketLayoutQuery.php
index 3835744..e74b66d 100644
--- a/lib/Model/TicketLayoutQuery.php
+++ b/lib/Model/TicketLayoutQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketLayoutQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/TicketLayoutTemplate.php b/lib/Model/TicketLayoutTemplate.php
index 2703178..59029b8 100644
--- a/lib/Model/TicketLayoutTemplate.php
+++ b/lib/Model/TicketLayoutTemplate.php
@@ -187,9 +187,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketLayoutTemplate to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/TicketLayoutTemplateQuery.php b/lib/Model/TicketLayoutTemplateQuery.php
index 2c01e19..a3bdc8d 100644
--- a/lib/Model/TicketLayoutTemplateQuery.php
+++ b/lib/Model/TicketLayoutTemplateQuery.php
@@ -110,9 +110,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketLayoutTemplateQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/TicketfeeException.php b/lib/Model/TicketfeeException.php
index 408a268..c365ef1 100644
--- a/lib/Model/TicketfeeException.php
+++ b/lib/Model/TicketfeeException.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketfeeException to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->pricetypeid)) {
             $result["pricetypeid"] = intval($this->pricetypeid);
diff --git a/lib/Model/TicketfeeRules.php b/lib/Model/TicketfeeRules.php
index b67b796..b809624 100644
--- a/lib/Model/TicketfeeRules.php
+++ b/lib/Model/TicketfeeRules.php
@@ -88,9 +88,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketfeeRules to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->default)) {
             $result["default"] = $this->default;
diff --git a/lib/Model/TicketfeeSaleschannelRule.php b/lib/Model/TicketfeeSaleschannelRule.php
index 8aa9a3a..f799fd8 100644
--- a/lib/Model/TicketfeeSaleschannelRule.php
+++ b/lib/Model/TicketfeeSaleschannelRule.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketfeeSaleschannelRule to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->saleschannelid)) {
             $result["saleschannelid"] = intval($this->saleschannelid);
diff --git a/lib/Model/TicketsEmaildeliveryRequest.php b/lib/Model/TicketsEmaildeliveryRequest.php
index 0bc0e33..7e80bf3 100644
--- a/lib/Model/TicketsEmaildeliveryRequest.php
+++ b/lib/Model/TicketsEmaildeliveryRequest.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsEmaildeliveryRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->templateid)) {
             $result["templateid"] = intval($this->templateid);
diff --git a/lib/Model/TicketsPdfRequest.php b/lib/Model/TicketsPdfRequest.php
index edc97b2..eed3d0e 100644
--- a/lib/Model/TicketsPdfRequest.php
+++ b/lib/Model/TicketsPdfRequest.php
@@ -87,9 +87,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsPdfRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->tickets)) {
             $result["tickets"] = $this->tickets;
diff --git a/lib/Model/TicketsalesFlowConfig.php b/lib/Model/TicketsalesFlowConfig.php
index ab21013..63124d7 100644
--- a/lib/Model/TicketsalesFlowConfig.php
+++ b/lib/Model/TicketsalesFlowConfig.php
@@ -102,9 +102,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsalesFlowConfig to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->from)) {
             $result["from"] = Json::packTimestamp($this->from);
diff --git a/lib/Model/Ticketsalesflow.php b/lib/Model/Ticketsalesflow.php
index 8169cb4..0b567e8 100644
--- a/lib/Model/Ticketsalesflow.php
+++ b/lib/Model/Ticketsalesflow.php
@@ -158,9 +158,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Ticketsalesflow to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/TicketsalesflowQuery.php b/lib/Model/TicketsalesflowQuery.php
index b40888e..09f31b6 100644
--- a/lib/Model/TicketsalesflowQuery.php
+++ b/lib/Model/TicketsalesflowQuery.php
@@ -92,9 +92,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsalesflowQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/Ticketsalessetup.php b/lib/Model/Ticketsalessetup.php
index ec0f37d..7c419bc 100644
--- a/lib/Model/Ticketsalessetup.php
+++ b/lib/Model/Ticketsalessetup.php
@@ -117,9 +117,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Ticketsalessetup to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/TicketsalessetupQuery.php b/lib/Model/TicketsalessetupQuery.php
index 5dbf674..71e59ce 100644
--- a/lib/Model/TicketsalessetupQuery.php
+++ b/lib/Model/TicketsalessetupQuery.php
@@ -92,9 +92,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsalessetupQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/TicketsprocessedRequest.php b/lib/Model/TicketsprocessedRequest.php
index 836debc..79902aa 100644
--- a/lib/Model/TicketsprocessedRequest.php
+++ b/lib/Model/TicketsprocessedRequest.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsprocessedRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->endts)) {
             $result["endts"] = strval($this->endts);
diff --git a/lib/Model/TicketsprocessedStatistics.php b/lib/Model/TicketsprocessedStatistics.php
index 3189586..e9c9204 100644
--- a/lib/Model/TicketsprocessedStatistics.php
+++ b/lib/Model/TicketsprocessedStatistics.php
@@ -94,9 +94,9 @@ public static function fromJson($obj) {
     /**
      * Serialize TicketsprocessedStatistics to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->processed)) {
             $result["processed"] = intval($this->processed);
diff --git a/lib/Model/Timestamp.php b/lib/Model/Timestamp.php
index 89ec36a..2704ed9 100644
--- a/lib/Model/Timestamp.php
+++ b/lib/Model/Timestamp.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Timestamp to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->systemtime)) {
             $result["systemtime"] = Json::packTimestamp($this->systemtime);
diff --git a/lib/Model/UpdateOrder.php b/lib/Model/UpdateOrder.php
index cee38e9..bc89fe9 100644
--- a/lib/Model/UpdateOrder.php
+++ b/lib/Model/UpdateOrder.php
@@ -136,9 +136,9 @@ public static function fromJson($obj) {
     /**
      * Serialize UpdateOrder to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->customerid)) {
             $result["customerid"] = intval($this->customerid);
diff --git a/lib/Model/UpdateProducts.php b/lib/Model/UpdateProducts.php
index a7580e2..8f78366 100644
--- a/lib/Model/UpdateProducts.php
+++ b/lib/Model/UpdateProducts.php
@@ -104,9 +104,9 @@ public static function fromJson($obj) {
     /**
      * Serialize UpdateProducts to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->operation)) {
             $result["operation"] = strval($this->operation);
diff --git a/lib/Model/UpdateTickets.php b/lib/Model/UpdateTickets.php
index 88a9eeb..eda23f8 100644
--- a/lib/Model/UpdateTickets.php
+++ b/lib/Model/UpdateTickets.php
@@ -117,9 +117,9 @@ public static function fromJson($obj) {
     /**
      * Serialize UpdateTickets to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->operation)) {
             $result["operation"] = strval($this->operation);
diff --git a/lib/Model/Url.php b/lib/Model/Url.php
index f348a2f..782feb7 100644
--- a/lib/Model/Url.php
+++ b/lib/Model/Url.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Url to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->url)) {
             $result["url"] = strval($this->url);
diff --git a/lib/Model/View.php b/lib/Model/View.php
index e4c8754..e5700dc 100644
--- a/lib/Model/View.php
+++ b/lib/Model/View.php
@@ -163,9 +163,9 @@ public static function fromJson($obj) {
     /**
      * Serialize View to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ViewColumn.php b/lib/Model/ViewColumn.php
index 0ad3007..b37332c 100644
--- a/lib/Model/ViewColumn.php
+++ b/lib/Model/ViewColumn.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ViewColumn to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/ViewQuery.php b/lib/Model/ViewQuery.php
index 5a34496..737d639 100644
--- a/lib/Model/ViewQuery.php
+++ b/lib/Model/ViewQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize ViewQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/Voucher.php b/lib/Model/Voucher.php
index 5ae20b5..3f12de1 100644
--- a/lib/Model/Voucher.php
+++ b/lib/Model/Voucher.php
@@ -220,9 +220,9 @@ public static function fromJson($obj) {
     /**
      * Serialize Voucher to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/VoucherCode.php b/lib/Model/VoucherCode.php
index bd3b307..ef6f89d 100644
--- a/lib/Model/VoucherCode.php
+++ b/lib/Model/VoucherCode.php
@@ -86,9 +86,9 @@ public static function fromJson($obj) {
     /**
      * Serialize VoucherCode to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->code)) {
             $result["code"] = strval($this->code);
diff --git a/lib/Model/VoucherQuery.php b/lib/Model/VoucherQuery.php
index 1424897..1a622fb 100644
--- a/lib/Model/VoucherQuery.php
+++ b/lib/Model/VoucherQuery.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize VoucherQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->typeid)) {
             $result["typeid"] = intval($this->typeid);
diff --git a/lib/Model/VoucherValidity.php b/lib/Model/VoucherValidity.php
index 2d09337..e91765c 100644
--- a/lib/Model/VoucherValidity.php
+++ b/lib/Model/VoucherValidity.php
@@ -108,9 +108,9 @@ public static function fromJson($obj) {
     /**
      * Serialize VoucherValidity to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->expiry_fixeddate)) {
             $result["expiry_fixeddate"] = Json::packTimestamp($this->expiry_fixeddate);
diff --git a/lib/Model/WaitingListRequest.php b/lib/Model/WaitingListRequest.php
index 16e6f68..74e7973 100644
--- a/lib/Model/WaitingListRequest.php
+++ b/lib/Model/WaitingListRequest.php
@@ -201,9 +201,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WaitingListRequest to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/WaitingListRequestItem.php b/lib/Model/WaitingListRequestItem.php
index 1a1122c..9aa7a09 100644
--- a/lib/Model/WaitingListRequestItem.php
+++ b/lib/Model/WaitingListRequestItem.php
@@ -104,9 +104,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WaitingListRequestItem to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->eventid)) {
             $result["eventid"] = intval($this->eventid);
diff --git a/lib/Model/WaitingListRequestItemTicket.php b/lib/Model/WaitingListRequestItemTicket.php
index 0d7fd98..afd0bbd 100644
--- a/lib/Model/WaitingListRequestItemTicket.php
+++ b/lib/Model/WaitingListRequestItemTicket.php
@@ -78,9 +78,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WaitingListRequestItemTicket to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->tickettypepriceid)) {
             $result["tickettypepriceid"] = intval($this->tickettypepriceid);
diff --git a/lib/Model/WaitingListRequestQuery.php b/lib/Model/WaitingListRequestQuery.php
index 4ca8524..f4283af 100644
--- a/lib/Model/WaitingListRequestQuery.php
+++ b/lib/Model/WaitingListRequestQuery.php
@@ -100,9 +100,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WaitingListRequestQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);
diff --git a/lib/Model/WebSalesSkin.php b/lib/Model/WebSalesSkin.php
index 9552112..f064bba 100644
--- a/lib/Model/WebSalesSkin.php
+++ b/lib/Model/WebSalesSkin.php
@@ -178,9 +178,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WebSalesSkin to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->id)) {
             $result["id"] = intval($this->id);
diff --git a/lib/Model/WebSalesSkinConfiguration.php b/lib/Model/WebSalesSkinConfiguration.php
index d19b9f1..f89aaf6 100644
--- a/lib/Model/WebSalesSkinConfiguration.php
+++ b/lib/Model/WebSalesSkinConfiguration.php
@@ -111,9 +111,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WebSalesSkinConfiguration to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->favicon)) {
             $result["favicon"] = strval($this->favicon);
diff --git a/lib/Model/WebSalesSkinQuery.php b/lib/Model/WebSalesSkinQuery.php
index 79eb6bd..874ed4b 100644
--- a/lib/Model/WebSalesSkinQuery.php
+++ b/lib/Model/WebSalesSkinQuery.php
@@ -92,9 +92,9 @@ public static function fromJson($obj) {
     /**
      * Serialize WebSalesSkinQuery to JSON.
      *
-     * @return array
+     * @return mixed
      */
-    public function jsonSerialize() {
+    public function jsonSerialize(): mixed {
         $result = array();
         if (!is_null($this->filter)) {
             $result["filter"] = strval($this->filter);