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：

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：

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：

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：

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：

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！