diff --git a/src/Message/Checkout/PurchaseRequest.php b/src/Message/Checkout/PurchaseRequest.php
index d3d2386d..d227329e 100644
--- a/src/Message/Checkout/PurchaseRequest.php
+++ b/src/Message/Checkout/PurchaseRequest.php
@@ -153,7 +153,8 @@ public function getData()
             'cancel_url' => $this->getCancelUrl(),
             'payment_method_types' => $this->getPaymentMethodTypes(),
             'mode' => $this->getMode(),
-            'line_items' => $this->getLineItems()
+            'line_items' => $this->getLineItems(),
+            'customer' => $this->getCustomerReference()
         );
 
         return $data;