微信公众号开发：商户如何给用户发红包实例讲解

互联网 18-8-1

1、商户调用接口时，通过指定发送对象以及发送金额的方式发放红包，这样的方式，允许商户灵活的应用于各种各样丰富的活动场景

2、领取到红包后，用户的资金直接进入微信零钱，避免繁复的领奖流程，带给用户微信支付原生的流畅体验

现金红包官网文档地址：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_1

调用现金红包接口需要使用到证书，请前往商户平台下载证书

官网有关详细证书的介绍：https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=4_3

因为发送现金红包是从商户平台余额扣款，所以商户平台的账户余额必须有充足的余额

下面是调用红包接口详细代码：1、签名的MD5加密类：

/// <summary>/// MD5UtilHelper 的摘要说明。/// </summary>public class MD5UtilHelper {    public MD5UtilHelper()     {        //         // TODO: 在此处添加构造函数逻辑         //     }    /// <summary>             /// 获取大写的MD5签名结果     /// </summary>     /// <param name="encypStr"></param>     /// <param name="charset"></param>     /// <returns></returns>     public static string GetMD5(string encypStr, string charset)     {        string retStr;         MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();        //创建md5对象         byte[] inputBye;        byte[] outputBye;        //使用GB2312编码方式把字符串转化为字节数组．         try         {             inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);         }        catch (Exception ex)         {             inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);         }         outputBye = m5.ComputeHash(inputBye);          retStr = System.BitConverter.ToString(outputBye);         retStr = retStr.Replace("-", "").ToUpper();        return retStr;     } }

2、处理参数的类：

public class RequestHandler     {        public RequestHandler(HttpContext httpContext)         {             Parameters = new Hashtable();            this.HttpContext = httpContext ?? HttpContext.Current;          }        /// <summary>         /// 密钥         /// </summary>         private string Key;        protected HttpContext HttpContext;        /// <summary>         /// 请求的参数         /// </summary>         protected Hashtable Parameters;        /// <summary>         /// debug信息         /// </summary>         private string DebugInfo;        /// <summary>         /// 初始化函数         /// </summary>         public virtual void Init()         {         }        /// <summary>         /// 获取debug信息         /// </summary>         /// <returns></returns>         public String GetDebugInfo()         {            return DebugInfo;         }        /// <summary>         /// 获取密钥         /// </summary>         /// <returns></returns>         public string GetKey()         {            return Key;         }        /// <summary>         /// 设置密钥         /// </summary>         /// <param name="key"></param>         public void SetKey(string key)         {            this.Key = key;         }        /// <summary>         /// 设置参数值         /// </summary>         /// <param name="parameter"></param>         /// <param name="parameterValue"></param>         public void SetParameter(string parameter, string parameterValue)         {            if (parameter != null && parameter != "")             {                if (Parameters.Contains(parameter))                 {                     Parameters.Remove(parameter);                 }                  Parameters.Add(parameter, parameterValue);             }         }        /// <summary>         /// 创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名         /// </summary>         /// <param name="key">参数名</param>         /// <param name="value">参数值</param>         /// key和value通常用于填充最后一组参数         /// <returns></returns>         public virtual string CreateMd5Sign(string key, string value)         {             StringBuilder sb = new StringBuilder();              ArrayList akeys = new ArrayList(Parameters.Keys);             akeys.Sort();            foreach (string k in akeys)             {                string v = (string)Parameters[k];                if (null != v && "".CompareTo(v) != 0                     && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)                 {                     sb.Append(k + "=" + v + "&");                 }             }              sb.Append(key + "=" + value);            string sign = MD5UtilHelper.GetMD5(sb.ToString(), GetCharset()).ToUpper();            return sign;         }        /// <summary>         /// 输出XML         /// </summary>         /// <returns></returns>         public string ParseXML()         {             StringBuilder sb = new StringBuilder();             sb.Append("<xml>");            foreach (string k in Parameters.Keys)             {                string v = (string)Parameters[k];                if (Regex.IsMatch(v, @"^[0-9.]$"))                 {                      sb.Append("<" + k + ">" + v + "</" + k + ">");                 }                else                 {                     sb.Append("<" + k + "><![CDATA[" + v + "]]></" + k + ">");                 }              }             sb.Append("</xml>");            return sb.ToString();         }        /// <summary>         /// 设置debug信息         /// </summary>         /// <param name="debugInfo"></param>         public void SetDebugInfo(String debugInfo)         {            this.DebugInfo = debugInfo;         }        public Hashtable GetAllParameters()         {            return this.Parameters;         }        protected virtual string GetCharset()         {            return this.HttpContext.Request.ContentEncoding.BodyName;         }     }

3、调用现金红包处理类：

 /// <summary>  /// 企业号微信支付接口  /// </summary>  public static class TenPay  {     #region 企业向用户发红包      /// <summary>      /// 用于企业向微信用户个人发红包      /// 目前支持向指定微信用户的openid个人发红包      /// </summary>      /// <param name="certPassword">apiclient_cert.p12证书密码即商户号</param>      /// <param name="data">微信支付需要post的xml数据</param>      /// <param name="certPath">apiclient_cert.p12的证书物理位置(例如：E:\projects\文档\微信商户平台证书\商户平台API证书</param>      /// <param name="timeOut"></param>      /// <returns></returns>      public static string Sendredpack(string data, string certPassword,string certPath, int timeOut = Config.TIME_OUT)      {         var urlFormat = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";         string cert = certPath;           ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);          X509Certificate2 cer = new X509Certificate2(cert, certPassword, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);         var formDataBytes = data == null ? new byte[0] : Encoding.UTF8.GetBytes(data);          MemoryStream ms = new MemoryStream();          ms.Write(formDataBytes, 0, formDataBytes.Length);          ms.Seek(0, SeekOrigin.Begin);//设置指针读取位置           HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlFormat);          request.ClientCertificates.Add(cer);          request.Method = "POST";          request.Timeout = timeOut;           request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";         #region 输入二进制流          if (ms != null)          {              ms.Position = 0;             //直接写入流              Stream requestStream = request.GetRequestStream();             byte[] buffer = new byte[1024];             int bytesRead = 0;             while ((bytesRead = ms.Read(buffer, 0, buffer.Length)) != 0)              {                  requestStream.Write(buffer, 0, bytesRead);              }              ms.Close();//关闭文件访问          }         #endregion           HttpWebResponse response = (HttpWebResponse)request.GetResponse();         using (Stream responseStream = response.GetResponseStream())          {             using (StreamReader myStreamReader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8")))              {                 string retString = myStreamReader.ReadToEnd();                 return retString;              }          }      }     private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)      {         if (errors == SslPolicyErrors.None)             return true;         return false;      }     #endregion   }

4、调用现金红包接口

#region 发送红包bool fals = false;   //记录发送红包是否成功string xmlResult = null;  //现金红包接口返回的xmlstring certPath = null;  //证书在服务器的物理位置string data = null;  //调用现金红包接口需要的数据try {     //创建支付应答对象     RequestHandler packageReqHandler = new RequestHandler(null);     //初始化     packageReqHandler.Init();     string nonceStr = TenPayV3Util.GetNoncestr();  //时间戳     //设置package订单参数     packageReqHandler.SetParameter("nonce_str", nonceStr);    //随机字符串，不长于32位     packageReqHandler.SetParameter("mch_billno", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"] + model.JournalNumber);//商户订单号（每个订单号必须唯一）组成：mch_id+yyyymmdd+10位一天内不能重复的数字。接口根据商户订单号支持重入，如出现超时可再调用。     packageReqHandler.SetParameter("mch_id", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"]);  //微信支付分配的商户号     packageReqHandler.SetParameter("wxappid", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_AppId"]);//微信分配的公众账号ID（企业号corpid即为此appId）。接口传入的所有appid应该为公众号的appid（在mp.weixin.qq.com申请的），不能为APP的appid（在open.weixin.qq.com申请的）。      packageReqHandler.SetParameter("send_name", "测试");//商户名称     packageReqHandler.SetParameter("re_openid", model.BankCard);  //用户openid  接受红包的用户用户在wxappid下的openid     packageReqHandler.SetParameter("total_amount", Convert.ToInt32((decimal)(model.Amount * 100M)).ToString(CultureInfo.InvariantCulture));  //付款金额 单位分     packageReqHandler.SetParameter("total_num", "1");  //红包发放总人数     packageReqHandler.SetParameter("wishing", "测试红包");  //红包祝福语     packageReqHandler.SetParameter("client_ip", HttpContext.Current.Request.UserHostAddress);//Ip地址     packageReqHandler.SetParameter("act_name", "测试红包");//活动名称     packageReqHandler.SetParameter("remark", "测试红包");     //备注     string sign = packageReqHandler.CreateMd5Sign("key", System.Configuration.ConfigurationManager.AppSettings["TenPayV3_Key"]);     packageReqHandler.SetParameter("sign", sign);                        //签名     data = packageReqHandler.ParseXML();     certPath = Server.MapPath("~/") + System.Configuration.ConfigurationManager.AppSettings["certPath"];     xmlResult = Sendredpack(data, System.Configuration.ConfigurationManager.AppSettings["TenPayV3_MchId"],certPath);     var res = XDocument.Parse(xmlResult);     string return_code = res.Element("xml").Element("return_code").Value;     if ("SUCCESS".Equals(return_code))     {         string result_code = res.Element("xml").Element("result_code").Value;         if ("SUCCESS".Equals(result_code))         {             fals = true;         }     } } catch (Exception exception) { }#endregion

注意：证书所在文件夹权限，IIS必须有权限对该文件夹操作的权限。

PHP微信公众号自动发送红包API，php公众红包api

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