对接微信和支付宝退款api

1、微信退款

参考：
(41条消息) weixin-java-pay实现公众号微信支付与退款_earthhour的博客-CSDN博客_weixin-java-pay

需要配置api证书
退款前的相关配置

    /**
     * @author seeklife
     * 微信api配置，注意退款需要设置api证书
     * @date 2022/8/6 14:14
     * @return null
     */
    public WxPayService wxService(){
        WxPayConfig payConfig = new WxPayConfig();
        payConfig.setAppId("wx6e904ddc50e1e4d4");
        payConfig.setMchId("1625744273");
        payConfig.setMchKey("W5iU6nmf3hQYI7oJACdz9corlmh5EtGC");
        InputStream stream1 = getClass().getClassLoader().getResourceAsStream("apiclient_cert.p12");
        File targetFile1 = new File("apiclient_cert.p12");
        try {
            FileUtils.copyInputStreamToFile(stream1, targetFile1);
        } catch (IOException e) {
            e.printStackTrace();
        }
        payConfig.setKeyPath(targetFile1.getPath());
        // 可以指定是否使用沙箱环境
        payConfig.setUseSandboxEnv(false);
        WxPayService wxPayService = new WxPayServiceImpl();
        wxPayService.setConfig(payConfig);
        return wxPayService;
    }

开始执行退款操作

/**
     * @author seeklife
     * 微信退款操作
     * @date 2022/8/5 16:38
     * @param orderNo
     * @param refundNo
     * @param money
     * @return java.lang.String
     */
    public String wxRefund(String mergeOrderNo,String orderNo,String refundNo,BigDecimal money) {
        WxPayService wxPayService = wxService();
        //申请退款
        WxPayRefundRequest refundInfo = WxPayRefundRequest.newBuilder()
                //订单号
                .outTradeNo(mergeOrderNo)
                //退款订单号
                .outRefundNo(refundNo)
                //金额 单位分
                .totalFee(yuanToFee(money))
                //退款金额
                .refundFee(yuanToFee(money))
                .notifyUrl("http://你的域名:8002/api/wx/refundNotify")
                .build();
        WxPayRefundResult wxPayRefundResult;
        try {
            wxPayRefundResult = wxPayService.refund(refundInfo);
            //判断退款信息是否正确
            if (REFUND_SUCCESS.equals(wxPayRefundResult.getReturnCode()) && REFUND_SUCCESS.equals(wxPayRefundResult.getResultCode())) {
                /**
                 * 系统内部业务逻辑
                 */
                updateRefundApply(orderNo,RefundListEnum.REFUND_HANDLE_1.getValue());
                return "正在退款中...";
            }
        } catch (WxPayException e) {
            log.error("微信退款接口错误信息= {}", e);
        }
        return "退款失败";
    }

回调

    /**
     * 仅支持一次性退款，多次退款需要修改逻辑
     * @param xmlData 微信返回的流数据
     * @return
     */
    @PostMapping("/wx/refundNotify")
    public String refundNotify(@RequestBody String xmlData) {
        WxPayService wxPayService = wxService();
        WxPayRefundNotifyResult wxPayRefundNotifyResult;
        try {
            wxPayRefundNotifyResult = wxPayService.parseRefundNotifyResult(xmlData);
        } catch (WxPayException e) {
            log.error("退款失败，失败信息:{}", e);
            return WxPayNotifyResponse.fail("退款失败");
        }
        //判断你返回状态信息是否正确
        if (REFUND_SUCCESS.equals(wxPayRefundNotifyResult.getReturnCode())) {
            WxPayRefundNotifyResult.ReqInfo reqInfo = wxPayRefundNotifyResult.getReqInfo();
            //判断退款状态
            if (REFUND_SUCCESS.equals(reqInfo.getRefundStatus())) {
                //内部订单号
                String outTradeNo = reqInfo.getOutTradeNo();
                /**
                 * 成功后的业务逻辑
                 */
                    return WxPayNotifyResponse.success("退款成功！");
                }
            }
        }
        return WxPayNotifyResponse.fail("回调有误!");
    }

2、支付宝退款

参考：
统一收单交易退款接口 - 支付宝文档中心 (alipay.com)

必须要使用公钥证书验签方式
详见：
springboot后端接入支付宝提现到余额功能 - 简书 (jianshu.com)

/**
 * @author seeklife
 * alipay退款操作
 * @date 2022/8/5 16:38
 * @param orderNo
 * @param refundNo
 * @param money
 * @return java.lang.String
 */
public String aliRefund(String mergeOrderNo,String orderNo,String refundNo,BigDecimal money) {
    AlipayClient alipayClient = Alipay.getInstance().getAlipayClient();
    AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();
    JSONObject bizContent = new JSONObject();
    bizContent.put("out_trade_no", mergeOrderNo);
    bizContent.put("refund_amount", money);
    bizContent.put("out_request_no", refundNo); //"HZ01RF001"
    //// 返回参数选项，按需传入
    //JSONArray queryOptions = new JSONArray();
    //queryOptions.add("refund_detail_item_list");
    //bizContent.put("query_options", queryOptions);

    request.setBizContent(bizContent.toString());
    AlipayTradeRefundResponse response = null;
    try {
        response = alipayClient.certificateExecute(request);
    } catch (AlipayApiException e) {
        e.printStackTrace();
    }
    if(response.isSuccess()){
        //支付宝退款成功
        updateRefundApply(orderNo,RefundListEnum.REFUND_HANDLE_2.getValue());
    }else{
        //支付宝支付失败
        updateRefundApply(orderNo,RefundListEnum.REFUND_HANDLE_3.getValue());
    }
    return response.getSubCode() +  response.getSubMsg();
}