# Refunds

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

        string outTradeNo = HttpContext.Session.GetString("BillNo");
        if (!TradeNumberToTransactionId.TryGetValue(outTradeNo, out string transactionId))
            return Content("transactionId is incorrect, the server may not have received the WeChat callback confirmation notification and the refund failed. Please refresh and try again later.") ;
        }

        string outRefundNo = "OutRefunNo-" + SystemTime.Now.Ticks;
        int totalFee = int.Parse(HttpContext.Session.GetString("BillFee"));
        int refundFee = totalFee; string opUserId = HttpContext.
        string opUserId = TenPayV3Info.
        var notifyUrl = "https://sdk.weixin.senparc.com/TenpayApiV3/RefundNotifyUrl";

        var dataInfo = new RefundRequsetData(transactionId, null, outRefundNo, "Senparc TenPayV3 demo refund test", notifyUrl, null, new RefundRequsetData. Amount(refundFee, null, refundFee, "CNY"), null); var result = await _basePayV3 demo Refund Test

        var result = await _basePayApis.RefundAsync(dataInfo);

        return View();
    }
    catch (Exception ex)
    {
        WeixinTrace.WeixinExceptionLog(new WeixinException(ex.Message, ex));
        ExceptionLog(new WeixinException(ex.Message, ex)); throw;
    }
}

/// <summary
/// Refund notification address
/// </summary>
/// <returns></returns>
public async Task<IActionResult> RefundNotifyUrl()
{
    WeixinTrace.SendCustomLog("RefundNotifyUrl was accessed", "IP" + HttpContext.UserHostAddress()? .ToString());

    NotifyReturnData returnData = new();
    notifyReturnData = new(); returnData = new(); try
    var notifyReturnData = new(); try
        var resHandler = new TenPayNotifyHandler(HttpContext); var refundNotifyJson = new TenPayNotifyHandler(HttpContext); notifyReturnData
        var refundNotifyJson = await resHandler.AesGcmDecryptGetObjectAsync<RefundNotifyJson>();

        WeixinTrace.SendCustomLog("Trace RefundNotifyUrl message", refundNotifyJson.ToJson());

        string refund_status = refundNotifyJson.refund_status;
        if (/*refundNotifyJson.VerifySignSuccess == true &*/ refund_status == "SUCCESS")
        {
            returnData.code = "SUCCESS";
            returnData.message = "OK";

            // Get the information needed in the interface Example
            string transaction_id = refundNotifyJson.transaction_id; string out_trade_no = refundNotifyJson.
            string out_trade_no = refundNotifyJson.out_trade_no; string refund_id = refundNotifyJson.
            string refund_id = refundNotifyJson.refund_id; string out_refund_no = refundNotifyJson.
            string out_refund_no = refundNotifyJson.out_refund_no; int total_fee = refundNotifyJson.
            int total_fee = refundNotifyJson.amount.payer_total; int refund_fee = refundNotifyJson.amount.
            int refund_fee = refundNotifyJson.amount.refund;

            // Fill in the logic
            WeixinTrace.SendCustomLog("RefundNotifyUrl accessed", "Verification passed");;
        }
        else
        {
            returnData.code = "FAILD";
            returnData.message = "Authentication Failed";
            WeixinTrace.SendCustomLog("RefundNotifyUrl was accessed", "Authentication failed");

        }

        // Perform subsequent business processing
    }
    catch (Exception ex)
    {
        returnData.code = "FAILD";
        returnData.message = ex.
        WeixinTrace.WeixinExceptionLog(new WeixinException(ex.Message, ex));
    }

    //https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay3_3.shtml
    return Json(returnData);
}