refactor

Author: Can Sözeri

src/Messages/AbstractResponse.php

@@ -89,8 +89,13 @@ public function isSuccessful(): bool
     {
         if ($this->getIsRedirect()) {
             return true;
-        } else {
-            return (string)$this->data->Transaction->Response->Code === '00';
         }
+
+        return (string)$this->data->Transaction->Response->Code === '00';
+    }
+
+    public function getTransactionReference(): ?string
+    {
+        return (string)$this->data->Transaction->RetrefNum;
     }
 }

src/Messages/PurchaseResponse.php

@@ -39,6 +39,6 @@ public function getRedirectUrl(): string
     {
         $urlType = $this->getRequest()->getParameters()['testMode'] ? 'test' : 'prod';
 
-        return $this->isRedirect() ? $this->redirectUrl[$urlType] : null;
+        return $this->isRedirect() ? $this->redirectUrl[$urlType] : '';
     }
 }