feat: 霸王餐充值修改

src/main/java/com/chaozhanggui/system/cashierservice/service/PayService.java

@@ -460,6 +460,9 @@ public class PayService {
             }
 
             shouldPayAmount = shouldPayAmount.subtract(userCouponVo.getDiscountAmount());
+            if (shouldPayAmount.compareTo(BigDecimal.ZERO) < 0) {
+                shouldPayAmount = new BigDecimal("0.01");
+            }
 
             TbShopCoupon tbShopCoupons = mpShopCouponMapper.selectById(userCouponVo.getCouponId());
             if (tbShopCoupons == null) {