java实现微信点餐申请微信退款

/**
  * 退款
  * @param orderDTO 订单
  */
 @Override
 public RefundResponse refund(OrderDTO orderDTO) {
  RefundRequest refundRequest = new RefundRequest();
  refundRequest.setOrderId(orderDTO.getOrderId());
  refundRequest.setOrderAmount(orderDTO.getOrderAmount().doubleValue());
  refundRequest.setPayTypeEnum(BestPayTypeEnum.WXPAY_H5);
  log.info("【微信退款】request={}", JsonUtil.toJson(refundRequest));
  //调用SDK
  RefundResponse refundResponse = bestPayService.refund(refundRequest);
  log.info("【微信退款】response={}", JsonUtil.toJson(refundResponse));
  return refundResponse;
 }

private String orderId;//订单号
private Double orderAmount;//订单金额
private String outTradeNo;//第三方支付流水号
private String refundId;//退款号（在此与订单号相同）
private String outRefundNo;//第三方退款流水号

/**
 * 取消订单
 * @param orderDTO 订单 
 * @return 取消的订单
*/
 @Override
 @Transactional
 public OrderDTO cancel(OrderDTO orderDTO) {
  OrderMaster orderMaster = new OrderMaster();
  //判断订单状态
  if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
   log.error("【取消订单】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
   throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
  }
  //修改订单状态
  orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
  BeanUtils.copyProperties(orderDTO, orderMaster);
  OrderMaster updateResult = orderMasterRepository.save(orderMaster);
  if (updateResult == null) {
   log.error("【取消订单】更新失败,orderMaster={}", orderMaster);
   throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
  }
  //返回库存
  if (CollectionUtils.isEmpty(orderDTO.getOrderDetailList())) {
   log.error("【取消订单】订单中无商品详情，orderDTO={}", orderDTO);
   throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
  }
  List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream()
    .map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
    .collect(Collectors.toList());
  productService.increaseStock(cartDTOList);
  //如果已支付，需要退款
  if (orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())) {
   payService.refund(orderDTO);
  }
  return orderDTO;
}