diff --git a/src/Message/ShopServerRefundRequest.php b/src/Message/ShopServerRefundRequest.php
index 660cb88..6afa25c 100644
--- a/src/Message/ShopServerRefundRequest.php
+++ b/src/Message/ShopServerRefundRequest.php
@@ -31,7 +31,7 @@ class ShopServerRefundRequest extends ShopServerAuthorizeRequest
     /**
      * The "request" parameter.
      */
-    protected $request_code = 'refund';
+    protected $request_code = 'debit';
 
     /**
      * Collect the data together to send to the Gateway.