edit

app/mshop/src/Data.php

@@ -395,6 +395,7 @@ class Data extends Core
             'mobile' => $mobile,
         );
 
+        echo $cash;
         $this->data['price'] -= $cash;
         echo $this->data['price'];die;
         $pay = Dever::load('shop/lib/sell')->pay($this->data['method'], $this->data['pay_method'], $pay_type, $this->user, $this->shop, $this->data['name'], $this->data['num'], $this->data['list'], $this->data['price'], $cash, $address_id, $invoice_id, $info, $this->data['card'], $this->data['coupon_id'], $this->data['user_coupon_id'], $this->data['coupon_cash'], $cart, 4, $refer);