# Refunds

/// <summary>
/// Refund request interface
/// </summary>
/// <returns></returns>
public ActionResult Refund()
{
    try
    {
        string nonceStr = TenPayV3Util.GetNoncestr(); string outTradeNo = HttpContext.

        string outTradeNo = HttpContext.Session.GetString("BillNo");

        string outRefundNo = "OutRefunNo-" + SystemTime.Now.Ticks; int totalFee = int.
        int totalFee = int.Parse(HttpContext.Session.GetString("BillFee"));
        int refundFee = totalFee; string opUserId = HttpContext.
        string opUserId = TenPayV3Info.
        var notifyUrl = "https://sdk.weixin.senparc.com/TenPayV3/RefundNotifyUrl";
        var dataInfo = new TenPayV3RefundRequestData(TenPayV3Info.AppId, TenPayV3Info.MchId, TenPayV3Info.Key,
        null, nonceStr, null, outTradeNo, outRefundNo, totalFee, refundFee, opUserId, null, notifyUrl: notifyUrl);

        var result = TenPayOldV3.Refund(_serviceProvider, dataInfo);//certificate address, password, set in configuration file and automatically recorded when registering WeChat payment information

        ViewData["Message"] = $"Refund result: {result.result_code} {result.err_code_des}. You can refresh the current page to see the latest results." ;
        return View();
    }
    catch (Exception ex)
    {
        WeixinTrace.WeixinExceptionLog(new WeixinException(ex.Message, ex));; } catch (Exception ex) { WeixinTrace.

        ExceptionLog(new WeixinException(ex.Message, ex)); throw;
    }
}

/// <summary
/// Refund notification address
/// </summary>
/// <returns></returns>
public ActionResult RefundNotifyUrl()
{
    string responseCode = "FAIL";
    string responseMsg = "FAIL";
    try
    {
        ResponseHandler resHandler = new ResponseHandler(HttpContext);

        string return_code = resHandler.GetParameter("return_code"); string return_msg = resHandler.
        string return_msg = resHandler.GetParameter("return_msg");

        WeixinTrace.SendCustomLog("Trace RefundNotifyUrl Message", resHandler.ParseXML());

        if (return_code == "SUCCESS")
        {
            responseCode = "SUCCESS";
            responseMsg = "OK";

            string appId = resHandler.GetParameter("appid");
            string mch_id = resHandler.GetParameter("mch_id");
            string nonce_str = resHandler.GetParameter("nonce_str");
            string req_info = resHandler.GetParameter("req_info");

            if (!appId.Equals(Senparc.Weixin.Config.SenparcWeixinSetting.TenPayV3_AppId))
            {
                /*
                    * Caution:
                    * The filter is added here only because ShengPai Demo often has other public numbers wrongly set our address, which
                    * causing it to not be able to decrypt properly, there is no need to filter for normal use!
                    */
                SenparcTrace.SendCustomLog("AppId of RefundNotifyUrl is incorrect",
                    $"appId:{appId}\r\nmch_id:{mch_id}\r\nreq_info:{req_info}");

                return Content("faild");
            }

            var decodeReqInfo = TenPayV3Util.DecodeRefundReqInfo(req_info, TenPayV3Info.Key);// decode
            var decodeDoc = XDocument.Parse(decodeReqInfo);

            //Get the information needed in the interface.
            string transaction_id = decodeDoc.Root.Element("transaction_id").Value;
            string out_trade_no = decodeDoc.Root.Element("out_trade_no").Value;
            string refund_id = decodeDoc.Root.Element("refund_id").Value;
            string out_refund_no = decodeDoc.Root.Element("out_refund_no").Value;
            int total_fee = int.Parse(decodeDoc.Root.Element("total_fee").Value);
            int? settlement_total_fee = decodeDoc.Root.Element("settlement_total_fee") != null
                    ? int.Parse(decodeDoc.Root.Element("settlement_total_fee").Value)
                    : null as int?;
            int refund_fee = int.Parse(decodeDoc.Root.Element("refund_fee").Value);
            int tosettlement_refund_feetal_fee = int.Parse(decodeDoc.Root.Element("settlement_refund_fee").Value);
            string refund_status = decodeDoc.Root.Element("refund_status").Value;
            string success_time = decodeDoc.Root.Element("success_time").Value;
            string refund_recv_accout = decodeDoc.Root.Element("refund_recv_accout").Value;
            string refund_account = decodeDoc.Root.Element("refund_account").Value;
            string refund_request_source = decodeDoc.Root.Element("refund_request_source").Value;

            // Validation passed, proceed to subsequent business processing
        }
    }
    catch (Exception ex)
    {
        responseMsg = ex.Message;
        WeixinTrace.WeixinExceptionLog(new WeixinException(ex.Message, ex));
    }

    string xml = string.Format(@"<xml>
<return_code><! [CDATA[{0}]]></return_code>
<return_msg><! [CDATA[{1}]]></return_msg>
</xml>", responseCode, responseMsg);
    return Content(xml, "text/xml");
}