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C#实现微信退款及对账功能的示例详解

目录
  • 需求
  • 基础准备
  • 关键代码
    • 操作界面
    • 退款订单类及方法
    • 退款功能实现
    • 对账
  • 支付商家后台相关要点
    • 实时交易帐单查询
    • 精确交易帐单查询
  • 小结

    需求

    在招聘报名系统里,考务费支付是其中一个环节,支付方式很多种,比如银联、微信、支付宝等等。本次我们以微信支付进行举例,在考生注册账号、编写简历、报名职位、被初审核通过等一系列基础的条件的具备下,可以进入支付考务费的环节(笔试费用),我们会为其生成一个支付二维码,考生支付后(无论成功与否),都会记录其支付结果状态。

    在实际的应用中,对于支付成功的考生,我们会遇到实现退款的需求,只要包括如下场景:

    1、根据政策规定,某些符合全部或部分退款条件的考生。

    2、其它未知原因,重复支付订单的考生。

    3、其它不可抗力,需求进行退款的考生。

    基础准备

    在实现功能前,做为企业,我们需要申请一个微信服务号,并成为微信支付商家。

    1、申请服务号

    申请成功后会获得到 AppId 和 AppSecret 用于后续开发,如关联支付商户、网页授权登录等。

    具体指引请参照微信公众平台首页:https://mp.weixin.qq.com/cgi-bin/loginpage

    2、成为微信支付商家

    申请成功后会获得 Mchid 和 paySignKey 用于微信支付、退款等,请在商家后台务必关联申请的公众号。

    具体指引请参照微信支付平台首页:https://pay.weixin.qq.com/index.php/core/home/login

    上述两个平台申请成功后,请登录微信支付商家平台,进行如下图操作:

    C#实现微信退款及对账功能的示例详解

    在产品中心、AppID帐号管理、关联 AppID(即申请的服务号) 

    另外一个重要配置是支付目录,我们写的支付程序需要在这里设置,如下图:

    C#实现微信退款及对账功能的示例详解

    关键代码

    操作界面

    界面上会显示最近一笔的微信订单支付情况,包括订单号、交费时间、交费金额、退款金额。其中退款金额不能大于成功交费金额,否则会返回失败。另外,还可以显示微信交易跟踪日志列表信息,如果订单号、交易价格、openid、返回信息、交易状态等。

    示例界面如下:

    C#实现微信退款及对账功能的示例详解

    退款订单类及方法

    实现微信退款,需要在支付商家平台申请退款证书,证书文件保存到自定义的目录中,在退款时指定路径。

    退款示例代码如下:

                    const string RefundOrderUrl = "https://api.mch.weixin.qq.com/secapi/pay/refund";   //退款申请API地址
                    const string RefundQueryUrl = "https://api.mch.weixin.qq.com/pay/refundquery";  //退款查询API地址
    //退款订单明细类
    public class RefundOrderDetail
                {
                    /// <summary>
                    /// 返回状态码,SUCCESS/FAIL 此字段是通信标识,非交易标识,交易是否成功需要查看trade_state来判断
                    /// </summary>
                    public string return_code = "";
     
                    /// <summary>
                    /// 返回信息返回信息,如非空,为错误原因 签名失败 参数格式校验错误
                    /// </summary>
                    public string return_msg = "";
     
                    /// <summary>
                    /// 业务结果,SUCCESS/FAIL
                    /// </summary>
                    public string result_code = "";
     
                    /// <summary>
                    /// 错误代码
                    /// </summary>
                    public string err_code = "";
     
                    /// <summary>
                    /// 错误代码描述
                    /// </summary>
                    public string err_code_des = "";
                    /// <summary>
                    /// 公众号ID(微信分配的公众账号 ID)
                    /// </summary>
                    public string appid = "";
     
                    /// <summary>
                    /// 商户号(微信支付分配的商户号)
                    /// </summary>
                    public string mch_id = "";
     
                    /// <summary>
                    /// 微信支付分配的终端设备号
                    /// </summary>
                    public string device_info = "";
     
                    /// <summary>
                    /// 随机字符串,不长于32位
                    /// </summary>
                    public string nonce_str = "";
     
                    /// <summary>
                    /// 签名
                    /// </summary>
                    public string sign = "";
                    /// <summary>
                    /// 微信支付订单号
                    /// </summary>
                    public string transaction_id = "";
                    /// <summary>
                    /// 商户系统的订单号,与请求一致。
                    /// </summary>
                    public string out_trade_no = "";
                    public string out_refund_no = "";
                    public string refund_id = "";
                    public string refund_fee = "";
                    public string settlement_refund_fee = "";
                    /// <summary>
                    /// 订单总金额,单位为分
                    /// </summary>
                    public string total_fee = "";
     
     
                    /// </summary>
                    public string settlement_total_fee = "";
     
                    public strin编程g fee_type = "";
     
                    public string cash_fee = "";
     
                    public string cash_fee_type = "";
     
                    public string cash_refund_fee = "";
     
                    public string coupon_type_0 = "";
     
                    public string coupon_refund_fee = "";
     
                    public string coupon_refund_fee_0 = "";
                    public string coupon_refund_count = "";
        javascript            public string coupon_refund_id_0 = "";
     
                }
    //退款订单类
                public class RefundOrder
                {
                    /// <summary>
                    /// 公众号ID(微信分配的公众账号 ID)
                    /// </summary>
                    public string appid = "";
                    /// <summary>
                    /// 商户号(微信支付分配的商户号)
                    /// </summary>
                    public string mch_id = "";
                    /// <summary>
                    /// 微信支付分配的终端设备号
                    /// </summary>
                    public string device_info = "";
                    /// <summary>
                    /// 随机字符串,不长于 32 位
                    /// </summary>
                    public string nonce_str = "";
                    /// <summary>
                    /// 签名
                    public string sign = "";
     
                    public string sign_type = "";
                    /// <summary>
                    /// 商户系统内部的订单号,32个字符内、可包含字母,确保在商户系统唯一,详细说明
                    /// </summary>
                    public string transaction_id = "";
                    public string out_trade_no = "";
                    public string out_refund_no = "";
                    /// <summary>
                    /// 订单总金额,单位为分,不能带小数点
                    /// </summary>
                    public int total_fee = 0;
                    public int refund_fee = 0;
                    public string  refund_fee_type = "";
                    public string op_user_id = "";
                    /// <summary>
                    public string refund_account = "";
                    /// <summary>
                }
    //查询对帐订单类
                public class QueryOrder
                {
                    /// <summary>
                    /// 公共号ID(微信分配的公众账号 ID)
                    /// </summary>
                    public string appid = "";
     
                    /// <summary>
                    /// 商户号(微信支付分配的商户号)
                    /// </summary>
                    public string mch_id = "";
     
                    /// <summary>
                    /// 微信订单号,优先使用
                    /// </summary>
                    public string transaction_id = "";
     
                    /// <summary>
                    /// 商户系统内部订单号
                    /// </summary>
                    public string out_trade_no = "";
     
                    /// <summary>
                    /// 随机字符串,不长于 32 位
                    /// </summary>
                    public string nonce_str = "";
     
                    /// <summary>
                    /// 签名,参与签名参数:appid,mch_id,transaction_id,out_trade_no,nonce_str,key
                    /// </summary>
                    public string sign = "";
                }
     
     
    //申请退款方法,返回退款订单明细类
    //参数refundorder为退款订单类, key 为支付签名KEY,cert为证书地址,password 为证书密码
                    public RefundOrderDetail getRefundOrderDetail(RefundOrder refundorder, string key,string cert,string password)
                    {
     
     
                        string post_data = getRefundOrderXML(refundorder, key);
                        string request_data = PostXmlAndCertToUrl(RefundOrderUrl, post_data,cert,password);
                        RefundOrderDetail orderdetail = new RefundOrderDetail();
                        SortedDictionary<string, string> requestXML = GetInfoFromXml(request_data);
                        foreach (KeyValuePair<string, string> k in requestXML)
                        {
                            switch (k.Key)
                            {
                                case "retuen_code":
                                    orderdetail.result_code = k.Value;
                                    break;
                                case "return_msg":
                                    orderdetail.return_msg = k.Value;
                                    break;
                                case "result_code":
                                    orderdetail.result_code = k.Value;
                                    break;
                                case "err_code":
                                    orderdetail.err_code = k.Value;
                                    break;
                                case "err_code_des":
                                    orderdetail.err_code_des = k.Value;
                                    break;
                                case "appid":
                                    orderdetail.appid = k.Value;
                                    break;
                                case "mch_id":
                                    orderdetail.mch_id = k.Value;
                                    break;
                                case "device_info":
                                    orderdetail.device_info = k.Value;
                                    break;
                                case "nonce_str":
                                    orderdetail.nonce_str = k.Value;
                                    break;
                                case "sign":
                                    orderdetail.sign = k.Value;
                                    break;
                                case "transaction_id":
                                    orderdetail.transaction_id = k.Value;
                                    break;
                                case "out_trade_no":
                                    orderdetail.out_trade_no = k.Value;
                                    break;
                                case "out_refund_no":
                                    orderdetail.out_refund_no = k.Value;
                                    break;
                                case "refund_id":
                                    orderdetail.refund_id = k.Value;
                                    break;
                                case "refund_fee":
                                    orderdetail.refund_fee = k.Value;
                                    break;
                                case "total_fee":
                                    orderdetail.total_fee = k.Value;
                                    break;
                                case "settlement_refund_fee":
               编程客栈                     orderdetail.settlement_refund_fee = k.Value;
                                    break;
                                case "settlement_total_fee":
                                    orderdetail.settlement_total_fee = k.Value;
                                    break;
                                case "fee_type":
                                    orderdetail.fee_type = k.Value;
                                    break;
                                case "cash_fee":
                                    orderdetail.cash_fee = k.Value;
                                    break;
                                case "cash_fee_type ":
                                    orderdetail.cash_fee_type = k.Value;
                                    break;
                                case "cash_refund_fee":
                                    orderdetail.cash_refund_fee = k.Value;
                                    break;
                                case "coupon_type_0":
                                    orderdetail.coupon_type_0 = k.Value;
                                    break;
                                case "coupon_refund_fee":
                                    orderdetail.coupon_refund_fee = k.Value;
                                    break;
                                case "coupon_refund_fee_0":
                                    orderdetail.coupon_refund_fee_0 = k.Value;
                                    break;
                                case "coupon_refund_count":
                                    orderdetail.coupon_refund_count = k.Value;
                                    break;
                                case "coupon_refund_id_0":
                                    orderdetail.coupon_refund_id_0 = k.Value;
                                    break;
                                default:
                                    break;
                            }
                        }
                        return orderdetail;
                    }
                    protected string getRefundOrderXml(RefundOrder refundorder, string key)
                    {
                        string return_string = string.Empty;
                        SortedDictionary<string, string> sParams = new SortedDictionary<string, string>();
                        sParams.Add("appid", refundorder.appid);
                        sParams.Add("mch_id", refundorder.mch_id);
    //                    sParams.Add("transaction_id", refundorder.transaction_id);
                        sParams.Add("out_trade_no", refundorder.out_trade_no);
                        sParams.Add("nonce_str", refundorder.nonce_str);
                        sParams.Add("out_refund_no", refundorder.out_refund_no);
                        sParams.Add("total_fee", refundorder.total_fee.ToString());
                        sParams.Add("refund_fee", refundorder.refund_fee.ToString());
                        sParams.Add("op_user_id", refundorder.op_user_id);
     
                        refundorder.sign = getsign(sParams, key);
                        sParams.Add("sign", refundorder.sign);
     
                        //拼接成XML请求数据
                        StringBuilder sbPay = new StringBuilder();
                        foreach (KeyValuePair<string, string> k in sParams)
                        {
                            if (k.Key == "attach" || k.Key == "body" || k.Key == "sign")
                            {
                                sbPay.Append("<" + k.Key + "><![CDATA[" + k.Value + "]]></" + k.Key + ">");
                            }
                            else
                            {
                                sbPay.Append("<" + k.Key + ">" + k.Value + "</" + k.Key + ">");
                            }
                        }
                        return_string = string.Format("<xml>{0}</xml>", sbPay.ToString().TrimEnd(','));
                        return return_string;
                    }
     
     
    public string PostXmlAndCertToUrl(string url, string postData,string cert,string password)
                    {
                        string resp = string.Empty;
     
                        ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
                        //调用证书
                        System.Security.Cryptography.X509Certificates.X509Certificate2 cer = new System.Security.Cryptography.X509Certificates.X509Certificate2(cert, password, System.Security.Cryptography.X509Certificates.X509KeyStorageFlags.PersistKeySet | System.Security.Cryptography.X509Certificates.X509KeyStorageFlags.MAChineKeySet);
     
                        HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
                        webrequest.ClientCertificates.Add(cer);
                        webrequest.Method = "post";
                        webrequest.ContentType = "application/x-www-form-urlencoded";
                        webrequest.ContentLength = postData.Length;
                        //webrequest.ContentType = "text/xml";
                        //byte[] data = System.Text.Encoding.UTF8.GetBytes(postData);
                        //webrequest.ContentLength = data.Length;
     
                        HttpWebResponse response = null;
                        try
                        {
                            StreamWriter swRequestWriter = new StreamWriter(webrequest.GetRequestStream());
                            swRequestWriter.Write(postData);
     
                            if (swRequestWriter != null)
                                swRequestWriter.Close();
     
                            response = (HttpWebResponse)webrequest.GetResponse();
                            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
                            {
                                resp = reader.ReadToEnd();
                            }
                        }
                        catch (Exception exp)
                        {
                            throw exp;
                        }
                        finally
                        {
                            if (response != null)
                                response.Close();
                        }
                        return resp;
                    }
                    public string getNoncestr()
                    {
                        Random random = new Random();
                        return GetMD5(random.Next(1000).ToString(), "GBK").ToLower().Replace("s", "S");
                    }

    退款功能实现

    假设点击退款按钮事件

    protected void Button_Click(oandroidbject sender, EventArgs e)
    {
            string appId = “”; //服务号的appId
            string paySignKey = “”; //申请的支付签名KEY;
            string mch_id = “”;  //申请的支付商户ID
     
            string OrderID = "";  //支付订单号
            string OrderAmount = (Convert.ToInt32((float.Parse(Amount.Text) * 100))).ToString();  //订单支付金额,Amount.Text 支付金额
            string RefundOrderAmount = (Convert.ToInt32((float.Parse(Amount.Text) * 100))).ToString();   //退款金额(Amount.Text)这里表示全额退款
            string RefundOrderID = Guid.NewGuid().ToString().Replace("-", "");   //生成退款订单号
     
     
    //创建退款订单
            RefundOrder order = new RefundOrder();
            order.appid = appId;
            order.mch_id = mch_id;
            order.out_trade_no = OrderID;
            order.nonce_str = tenpay.getNoncestr();
            order.out_refund_no = RefundOrderID;
            order.total_fee = int.Parse(OrderAmount);
            order.refund_fee = int.Parse(RefundOrderAmount);
            order.op_user_id = mch_id;
     
            string cert = “d:\\apiclient_cert.p12";  //退款证书路径
            //私钥(在安装证书时设置)
            string password =""; //证书密码
    //创建订单明细类,调用getRefundOrderDetail方法进行退款
            RefundOrderDetail orderdetail = getRefundOrderDetail(order, paySignKey, cert, password);
            string rv = ("退款订单号:" + RefundOrderID + "<br>");
            try
            {
                rv += ("退款金额:" + (double.Parse(orderdetail.total_fee) / 100).ToString() + "<br>");
            }
            catch (Exception eee)
            {
                rv += ("退款金额:<br>");
            }
            rv += ("交易状态:&nbsp;" + (orderdetail.result_code == "SUCCESS" ? "退款申请成功" : "退款申请失败") + "(" + orderdetail.result_code + ")" + "<br>");
            rv += ("可能的错误描述:" + orderdetail.err_code_des);
    }

    对账

    退款申请成功后,仅为申请状态,需要通过查询退款情况以确定是否完成,该功能可以在考生方进行实现,考生可随时查询自己的对帐情况。

    以下是参考代码,该代码可实现支付与退款的查询:

    protected void queryOrder(object sender, EventArgs e)
    {
        string OrderID =”“; //订单号
        string paytype = ”“;  //查询类型,支付消费或退款
        string appId = "";   //服务号 appid
        string paySignKey = "";   //支付签名key
        stphpring mch_id = "";    //支付商户号
        if (paytype == "消费")
        {
            try
            {
     
                string openid = ”“;   
     
     
                QueryOrder order = new QueryOrder();
                order.appid = appId;
                order.mch_id = mch_id;
                order.out_trade_no = OrderID;
                order.nonce_str = getNoncestr();
                OrderDetail orderdetail = getOrderDetail(order, paySignKey);
     
                string rv = ("订单号:" + OrderID + "<br>");
                rv += ("付款人ID比对识别:" + (openid == orderdetail.openid ? "成功" : "失败") + "<br>");
                rv += ("交易金额:" + (double.Parse(orderdetail.total_fee) / 100).ToString() + "<br>");
                rv += ("交易状态:&nbsp;" + (orderdetail.trade_state == "SUCCESS" ? "成功" : "失败") + "(" + orderdetail.trade_state + ")" + "<br>");
                rv += ("支付交易时间:" + (orderdetail.time_end != "" && orderdetail.time_end.Length == 14 ? orderdetail.time_end.Substring(0, 4) + "-" + orderdetail.time_end.Substring(4, 2) + "-" + orderdetail.time_end.Substring(6, 2) + " " + orderdetail.time_end.Substring(8, 2) + ":" + orderdetail.time_end.Substring(10, 2) + ":" + orderdetail.time_end.Substring(12, 2) : "") + "<br>");
     
            }
            catch (Exception ex)
            {
                return;
            }
        }
        else if (paytype == "退款")
        {
            try
            {
     
                RefundOrder order = new RefundOrder();
                order.appid = appId;
                order.mch_id = mch_id;
                order.out_trade_no = OrderID;
                order.nonce_str = getNoncestr();
     
     
                RefundOrderDetail orderdetail = getRefundQueryOrderDetail(order, paySignKey);
                string rv = ("交易状态:&nbsp;" + (orderdetail.result_code == "SUCCESS" ? "成功" : "失败") + "(" + orderdetail.result_code + ")" + "<br>");
                rv += ("其它说明:" + orderdetail.err_code_des);
     
            }
            catch (Exception ex)
            {
            }
        }
    }

    支付商家后台相关要点

    实时交易帐单查询

    登录后台后,该操作可以进行实时交易的帐单对帐功能,以备在争议的时候进行查询,基本操作如下图:

    C#实现微信退款及对账功能的示例详解

    点击交易中心、交易订单、批量订单查询、查询即可下载EXCEL格式的订单。

    精确交易帐单查询

    登录后台后,可查询精确交易帐单,该帐单每天10:00更新前一天的数据交易,我们可以进行CSV格式的下载,操作如下图:

    C#实现微信退款及对账功能的示例详解

    点击交易中心、交易帐单、打包下载即可,请注意图中圈注的提示。 

    小结

    文章提供的代码仅供参考,在实际的应用中,我们还可以根据业务需要编写其它功能,如下载微信官方对帐单,导入到应用系统中,与业务数据进行对帐,以排查争议数据;查询订单结果状态以更新业务争议状态信息等。

    以上就是C#实现微信退款及对账功能的示例详解的详细内容,更多关于C#实现微信退款及对账的资料请关注编程客栈(www.devze.com)其它相关文章!

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