diff --git a/src/Api/ApiAction.php b/src/Api/ApiAction.php
index 85916c7..a82e70d 100644
--- a/src/Api/ApiAction.php
+++ b/src/Api/ApiAction.php
@@ -34,6 +34,9 @@ class ApiAction
 
     private $clientName;
 
+    /** @var string */
+    private $clientId;
+
     public function __construct(Token $Token, bool $productionMode)
     {
         $this->productionMode = $productionMode;
@@ -149,6 +152,12 @@ public function getClientName()
         return $this->clientName;
     }
 
+    public function setClientId($clientId)
+    {
+        $parts = explode('-', $clientId);
+        $this->clientId = $parts[0];
+    }
+
     public function enableVerbose()
     {
         $this->Curl->enableVerbose();
@@ -177,7 +186,7 @@ protected function sendRequest($apiMethod, $requestMethod, $fields = [], $header
             $headers[] = 'X-Client-Source: '.$this->clientName;
         }
 
-        $headers[] = 'User-Agent: tpay.com PHP SDK Client/'.gethostname().'/'.$this->clientName;
+        $headers[] = 'User-Agent: tpay.com PHP SDK Client/'.gethostname().'/'.$this->clientName.'/'.$this->clientId;
 
         Logger::log(
             'Outgoing request',
diff --git a/src/Api/TpayApi.php b/src/Api/TpayApi.php
index 66ca600..63267d6 100644
--- a/src/Api/TpayApi.php
+++ b/src/Api/TpayApi.php
@@ -101,6 +101,7 @@ public function accounts()
             $this->accounts = (new AccountsApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->accounts->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->accounts->setClientName($this->clientName);
             }
@@ -117,6 +118,7 @@ public function authorization()
             $this->authorization = (new AuthorizationApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->authorization->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->authorization->setClientName($this->clientName);
             }
@@ -133,6 +135,7 @@ public function refunds()
             $this->refunds = (new RefundsApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->refunds->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->refunds->setClientName($this->clientName);
             }
@@ -149,6 +152,7 @@ public function reports()
             $this->reports = (new ReportsApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->reports->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->reports->setClientName($this->clientName);
             }
@@ -165,6 +169,7 @@ public function transactions()
             $this->transactions = (new TransactionsApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->transactions->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->transactions->setClientName($this->clientName);
             }
@@ -181,6 +186,7 @@ public function collect()
             $this->collect = (new CollectApi($this->token, $this->productionMode))
                 ->overrideApiUrl($this->apiUrl);
 
+            $this->collect->setClientId($this->clientId);
             if ($this->clientName) {
                 $this->collect->setClientName($this->clientName);
             }
@@ -209,6 +215,7 @@ private function authorize()
 
         $authApi = (new AuthorizationApi(new Token(), $this->productionMode))->overrideApiUrl($this->apiUrl);
 
+        $authApi->setClientId($this->clientId);
         if ($this->clientName) {
             $authApi->setClientName($this->clientName);
         }
diff --git a/src/SdkVersion.php b/src/SdkVersion.php
index a11ca4b..e9e4a49 100644
--- a/src/SdkVersion.php
+++ b/src/SdkVersion.php
@@ -4,5 +4,5 @@
 
 final class SdkVersion
 {
-    const VERSION = '2.4.3';
+    const VERSION = '2.4.4';
 }