Merge branch 'master' into feature/PLUG-5209

Author: woutse

includes/classes/PPMFWC/Gateway/Abstract.php

@@ -820,7 +820,7 @@ public function process_refund($order_id, $amount = null, $reason = '')
 
             $config = PPMFWC_Helper_Config::getPayConfig();
 
-            $request = new PayNL\Sdk\Model\Request\TransactionRefundRequest($transactionId, $amount);
+            $request = new PayNL\Sdk\Model\Request\TransactionRefundRequest($transactionId, $amount, $order->get_currency());
 
             $payOrder = $request->setConfig($config)->start();