diff --git a/src/Message/PurchaseResponse.php b/src/Message/PurchaseResponse.php
index 6a211a5..bbf5629 100644
--- a/src/Message/PurchaseResponse.php
+++ b/src/Message/PurchaseResponse.php
@@ -7,7 +7,6 @@
 
 class PurchaseResponse extends AbstractResponse implements RedirectResponseInterface
 {
-
     /**
      * Is the response successful?
      *
@@ -53,4 +52,12 @@ public function getState()
     {
         return $this->data['state'];
     }
+
+    public function getTransactionReference()
+    {
+        if (isset($this->data['id'])) {
+            return $this->data['id'];
+        }
+        return null;
+    }
 }
\ No newline at end of file