diff --git a/lib/Client.php b/lib/Client.php
index d52ad76..53a96f1 100644
--- a/lib/Client.php
+++ b/lib/Client.php
@@ -82,6 +82,13 @@ class Client {
      */
     public $language;
 
+    /**
+     * Callback called on every new request created
+     *
+     * @var \Closure
+     */
+    private $newRequestEventCallback;
+
     /**
      * Create a new API client
      *
@@ -104,7 +111,11 @@ public function __construct($accountcode, $accesskey, $secretkey) {
      * @return Request
      */
     public function newRequest($method, $url) {
-        return new Request($this, $method, $url);
+        $request = new Request($this, $method, $url);
+        if (isset($this->newRequestEventCallback)) {
+            ($this->newRequestEventCallback)($request);
+        }
+        return $request;
     }
 
     /**
@@ -115,4 +126,13 @@ public function newRequest($method, $url) {
     public function setLanguage($lang) {
         $this->language = $lang;
     }
+
+    /**
+     * Set new request event callback
+     *
+     * @param \Closure $newRequestEventCallback
+     */
+    public function setNewRequestEventCallback(\Closure $newRequestEventCallback) {
+        $this->newRequestEventCallback = $newRequestEventCallback;
+    }
 }
diff --git a/lib/Model/Contact.php b/lib/Model/Contact.php
index 12f2535..fe9621a 100644
--- a/lib/Model/Contact.php
+++ b/lib/Model/Contact.php
@@ -301,7 +301,7 @@ public function jsonSerialize() {
             $result["addresses"] = $this->addresses;
         }
         if (!is_null($this->birthdate)) {
-            $result["birthdate"] = Json::packTimestamp($this->birthdate);
+            $result["birthdate"] = !empty($this->birthdate) ? Json::packTimestamp($this->birthdate) : null;
         }
         if (!is_null($this->company)) {
             $result["company"] = strval($this->company);
diff --git a/lib/Model/Event.php b/lib/Model/Event.php
index 847ae1a..e24ed15 100644
--- a/lib/Model/Event.php
+++ b/lib/Model/Event.php
@@ -487,6 +487,7 @@ public static function fromJson($obj) {
             "webremark" => isset($obj->webremark) ? $obj->webremark : null,
             "createdts" => isset($obj->createdts) ? Json::unpackTimestamp($obj->createdts) : null,
             "lastupdatets" => isset($obj->lastupdatets) ? Json::unpackTimestamp($obj->lastupdatets) : null,
+            "totalmaxtickets" => isset($obj->totalmaxtickets) ? $obj->totalmaxtickets : null,
         ));
 
         $result->custom_fields = array();
diff --git a/lib/Model/ProductProperty.php b/lib/Model/ProductProperty.php
index 0ae662c..5a60e44 100644
--- a/lib/Model/ProductProperty.php
+++ b/lib/Model/ProductProperty.php
@@ -79,6 +79,11 @@ public function __construct(array $data = array()) {
      */
     public $values;
 
+    /**
+     * @var string
+     */
+    public $isarchived;
+
     /**
      * Unpack ProductProperty from JSON.
      *
@@ -96,6 +101,7 @@ public static function fromJson($obj) {
             "description" => isset($obj->description) ? $obj->description : null,
             "key" => isset($obj->key) ? $obj->key : null,
             "values" => isset($obj->values) ? Json::unpackArray("KeyValueItem", $obj->values) : null,
+            "isarchived" => $obj->isarchived ?? null
         ));
     }
 
@@ -118,6 +124,9 @@ public function jsonSerialize() {
         if (!is_null($this->values)) {
             $result["values"] = $this->values;
         }
+        if (!is_null($this->isarchived)) {
+            $result["isarchived"] = $this->isarchived;
+        }
 
         return $result;
     }
diff --git a/lib/Request.php b/lib/Request.php
index dcb91e1..7b17b22 100644
--- a/lib/Request.php
+++ b/lib/Request.php
@@ -83,6 +83,34 @@ class Request {
      */
     private $responseHeaders;
 
+    /**
+     * The number of milliseconds to wait while trying to connect
+     *
+     * @var int
+     */
+    private $connectTimeoutMs;
+
+    /**
+     * The maximum number of milliseconds to allow the request to execute
+     *
+     * @var int
+     */
+    private $timeoutMs;
+
+    /**
+     * The proxy to tunnel requests through
+     *
+     * @var string
+     */
+    private $proxy;
+
+    /**
+     * FALSE to stop cURL from verifying the peer's certificate.
+     *
+     * @var bool
+     */
+    private $sslVerifyPeer;
+
     /**
      * Create a new API request.
      *
@@ -149,11 +177,28 @@ private function prepare() {
         curl_setopt($c, CURLOPT_CUSTOMREQUEST, $this->method);
         curl_setopt($c, CURLOPT_HEADERFUNCTION, array($this, 'handleHeader'));
 
+        if (isset($this->sslVerifyPeer)) {
+            curl_setopt($c, CURLOPT_SSL_VERIFYPEER, $this->sslVerifyPeer);
+        }
         if (isset($_SERVER["TM_TRAVIS"])) {
             // Travis has a broken CA cert bundle, ignore errors there
             curl_setopt($c, CURLOPT_SSL_VERIFYPEER, FALSE);
         }
 
+        if (isset($this->connectTimeoutMs)) {
+            curl_setopt($c, CURLOPT_CONNECTTIMEOUT_MS, $this->connectTimeoutMs);
+        }
+        if (isset($this->timeoutMs)) {
+            curl_setopt($c, CURLOPT_TIMEOUT_MS, $this->timeoutMs);
+        }
+        if (!empty($this->proxy)) {
+            list($proxy, $proxyPort) = explode(':', $this->proxy);
+            curl_setopt($c, CURLOPT_PROXY, $proxy);
+            if (ctype_digit($proxyPort)) {
+                curl_setopt($c, CURLOPT_PROXYPORT, $proxyPort);
+            }
+        }
+
         if ($this->client->language) {
             $headers[] = "Accept-Language: " . $this->client->language;
         }
@@ -163,9 +208,7 @@ private function prepare() {
             $headers[] = "Expect:"; // issue with cURL when doing big size POSTs https://stackoverflow.com/questions/14158675/how-can-i-stop-curl-from-using-100-continue
             if ($this->bodycontenttype == "json") {
                 foreach ($this->body as $key => $value) {
-                    if (!is_null($value)) {
-                        $body[$key] = $value;
-                    }
+                    $body[$key] = $value;
                 }
                 $body = json_encode($body);
                 $headers[] = "Content-Type: application/json";
@@ -276,9 +319,16 @@ public static function checkError($c, $output, array $headers = array()) {
         if ($info["http_code"] == 429) {
             $backoff = isset($headers["retry-after"]) ? $headers["retry-after"] : 0;
             throw new RateLimitException($backoff);
-        } else if ($info["http_code"] != 200) {
-            if ($info["http_code"] == 0) {
+        }
+        else {
+            if ($info["http_code"] == 200) {
+                // time-outs have a 200 code incl. an error, so we should check it
                 $output = curl_error($c);
+
+                // No error, so return
+                if (empty($output)) {
+                    return;
+                }
             }
             throw new ClientException($info["http_code"], $output);
         }
@@ -291,4 +341,47 @@ public function handleHeader($curl, $header) {
         }
         return strlen($header);
     }
+
+    /**
+     * Set number of milliseconds to wait while trying to connect
+     * Use 0 to wait indefinitely.
+     *
+     * @param int $connectTimeoutMs
+     *
+     */
+    public function setConnectTimeoutMs(int $connectTimeoutMs) {
+        $this->connectTimeoutMs = $connectTimeoutMs;
+    }
+
+    /**
+     * Set maximum time the request is allowed to take in milliseconds
+     * Use 0 to wait indefinitely.
+     *
+     * @param int $timeoutMs
+     *
+     */
+    public function setTimeoutMs(int $timeoutMs) {
+        $this->timeoutMs = $timeoutMs;
+    }
+
+    /**
+     * The proxy to tunnel requests through
+     * Use : seperator to to add a port
+     *
+     * @param string $proxy
+     *
+     */
+    public function setProxy(string $proxy) {
+        $this->proxy = $proxy;
+    }
+
+    /**
+     * FALSE to stop cURL from verifying the peer's certificate.
+     *
+     * @param bool $sslVerifyPeer
+     *
+     */
+    public function setSslVerifyPeer(bool $sslVerifyPeer) {
+        $this->sslVerifyPeer = $sslVerifyPeer;
+    }
 }