完善功能

app/api/controller/pay/WxpayController.php

@@ -35,7 +35,7 @@ class WxpayController
 
         Db::beginTransaction();
         try {
-            $payDetail->pay_prepayid = 'ALIPAY';
+            $payDetail->pay_prepayid = 'WXPAY';
             $payDetail->save();
 
             if ($params['platform'] == 'android'){