diff --git a/src/Iyzipay/RequestStringBuilder.php b/src/Iyzipay/RequestStringBuilder.php
index 3849beb5..a5bfe9f3 100644
--- a/src/Iyzipay/RequestStringBuilder.php
+++ b/src/Iyzipay/RequestStringBuilder.php
@@ -166,6 +166,9 @@ public static function requestToStringQuery(Request $request, $type = null)
             if($request->getPaymentConversationId()) {
                 $stringQuery .= "?paymentConversationId=" . $request->getPaymentConversationId();
             }
+            if($request->getPaymentId()) {
+                $stringQuery .= "?paymentId=" . $request->getPaymentId();
+            }
         }
 
         if($type == 'reportingTransaction') {
@@ -254,4 +257,4 @@ public static function requestToStringQuery(Request $request, $type = null)
 
         return $stringQuery;
     }
-}
\ No newline at end of file
+}