update

src/main/java/au/com/royalpay/payment/manage/appclient/web/RetailAppController.java

@@ -437,7 +437,7 @@ public class RetailAppController {
     }
 
     @RequestMapping(value = "/qrcode", method = RequestMethod.GET)
-    public JSONObject getQrcode(@ModelAttribute(RETAIL_DEVICE) JSONObject device,@RequestParam(required = false) int client_id, QRCodeConfig config) {
+    public JSONObject getQrcode(@ModelAttribute(RETAIL_DEVICE) JSONObject device,@RequestParam(required = false,defaultValue = "0") int client_id, QRCodeConfig config) {
         if(client_id==0){
             client_id = device.getIntValue("client_id");
         }