diff --git a/docs/THREED-PAYMENT-EXAMPLE.md b/docs/THREED-PAYMENT-EXAMPLE.md
index 2ca09672..c5ca8790 100644
--- a/docs/THREED-PAYMENT-EXAMPLE.md
+++ b/docs/THREED-PAYMENT-EXAMPLE.md
@@ -201,7 +201,7 @@ try {
                 ],
             ];
             $requestData = $requestDataPreparedEvent->getRequestData();
-            $requestData = array_merge($requestData, $additionalRequestDataForKuveyt);
+            $requestData = array_merge_recursive($requestData, $additionalRequestDataForKuveyt);
             $requestDataPreparedEvent->setRequestData($requestData);
         });
 
diff --git a/examples/_common-codes/3d/form.php b/examples/_common-codes/3d/form.php
index 5571d655..c5799c8d 100644
--- a/examples/_common-codes/3d/form.php
+++ b/examples/_common-codes/3d/form.php
@@ -117,7 +117,7 @@ function (RequestDataPreparedEvent $requestDataPreparedEvent) use ($pos): void {
                 ],
             ];
             $requestData = $requestDataPreparedEvent->getRequestData();
-            $requestData = array_merge($requestData, $additionalRequestDataForKuveyt);
+            $requestData = array_merge_recursive($requestData, $additionalRequestDataForKuveyt);
             $requestDataPreparedEvent->setRequestData($requestData);
         });