调整通过砍价单下单

app/Services/OrderService.php

@@ -196,6 +196,11 @@ class OrderService
         // 订单支付金额=商品总额-券折扣金额-会员折扣金额+邮费
         $totalAmount = $productsTotalAmount - $couponDiscountAmount - $vipDiscountAmount;
 
+        //如果有砍价优惠
+        if ($bargainOrder) {
+            $totalAmount -= $bargainOrder->bargain_price;
+        }
+
         if ($totalAmount < 0) {
             $totalAmount = 0;
         }