企业微信-付款到员工零钱

本次内容是基于独立的“企业微信”而言的；

企业微信有独立的管理后台，和一般的服务号，订阅号后台不同；

企业微信涉及员工，所以这里的支付是付款到员工零钱；

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官方API文档：

https://work.weixin.qq.com/api/doc#90000/90135/90278

下面具体步骤：

1：先获取access_token

代码：

 protected void Button1_Click(object sender, EventArgs e)
    {
        //企业微信ID(替换成自己的)
        var corpid = "wx88888888";

        //企业微信支付秘钥(替换成自己的)
        var corpsecret = "88888888";

        var url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid={0}&corpsecret={1}", corpid, corpsecret);

        var msg = HttpGet(url);

        Log.DBLog(msg);

    }

2：userid与openid互换

代码：

    protected void Button2_Click(object sender, EventArgs e)
    {
        //授权后获取的access_token(替换成自己的)
        var token = "88888888";

        var url = string.Format("https://qyapi.weixin.qq.com/cgi-bin/user/convert_to_openid?access_token={0}", token);

        var msg = HttpPost(url, "{"userid": "chenhaibo"}");

        Log.DBLog(msg);
        
    }

3：企业微信签名算法

付款api固定如下几个字段参与签名：
amount　　//支付的钱转成单位（分）
appid　　//企业微信ID
desc　　//付款说明
mch_id　　//微信支付的商户号
nonce_str　　//随机字符串
openid　　//员工openid
partner_trade_no　　//订单号
ww_msg_type　　//付款消息类型

代码：

  string[] signTemp = { "amount=" + total_fee, "appid=" + APPID, "desc=" + title, "mch_id=" + PARTNER, "nonce_str=" + wx_nonceStr, "openid=" + toOpenid, "partner_trade_no=" + Bill_No, "ww_msg_type=" + "NORMAL_MSG" };

        List<string> signList = signTemp.ToList();
        signList.Sort();

        string signOld = string.Empty;

        foreach (string temp in signList)
        {
            signOld += temp + "&";
        }
        signOld = signOld.Substring(0, signOld.Length - 1);

        //拼接secret
        signOld += "&secret=" + Secret;

        //得到workwx_sign
        string get_workwx_sign = Encrypt(signOld).ToUpper();

MD5加密的方法：

 /// <summary>
    /// Md5加密
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public static String Encrypt(String s)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
        bytes = md5.ComputeHash(bytes);
        md5.Clear();
        string ret = "";
        for (int i = 0; i < bytes.Length; i++)
        {
            ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');
        }
        return ret.PadLeft(32, '0');
    }

4：微信支付签名算法

签名字段：除sign字段外所有字段都参与签名（包括企业微信签名字段workwx_sign一起参与签名）。

SortedDictionary<string, string> dic1 = new SortedDictionary<string, string>();

        dic1.Add("appid", APPID);
        dic1.Add("mch_id", PARTNER);
        //dic.Add("device_info", "013467007045711");//可为空
        dic1.Add("nonce_str", wx_nonceStr);
        dic1.Add("partner_trade_no", Bill_No);
        dic1.Add("openid", toOpenid);
        dic1.Add("check_name", "NO_CHECK");
        dic1.Add("amount", total_fee);
        dic1.Add("desc", title);//商品描述
        dic1.Add("spbill_create_ip", "127.0.0.1"); //换成你自己的代码部署的公网IP
        dic1.Add("workwx_sign", get_workwx_sign);
        dic1.Add("ww_msg_type", "NORMAL_MSG");
        dic1.Add("act_name", title);

        //得到支付签名
        string get_sign = BuildRequest(dic1, PARTNER_KEY);//PARTNER_KEY是微信支付商户号里面的API密钥

BuildRequest方法包含：
1：参数过滤
2：参数名ASCII码从小到大排序（字典序）
3：拼接成字符串
4：拼接支付密钥
5：MD5加密

 public static string BuildRequest(SortedDictionary<string, string> sParaTemp, string key)
    {
        //获取过滤后的数组
        Dictionary<string, string> dicPara = new Dictionary<string, string>();
        dicPara = FilterPara(sParaTemp);

        //组合参数数组
        string prestr = CreateLinkString(dicPara);

        //拼接支付密钥
        string stringSignTemp = prestr + "&key=" + key;

        //Vincent._Log.SaveMessage("生成签名的参数：" + stringSignTemp);
        Log.DBLog("生成签名的参数：" + stringSignTemp);

        //获得加密结果
        string myMd5Str = GetMD5(stringSignTemp.Trim());

        //返回转换为大写的加密串
        return myMd5Str.ToUpper();
    }

    /// <summary>
    /// 除去数组中的空值和签名参数并以字母a到z的顺序排序
    /// </summary>
    /// <param name="dicArrayPre">过滤前的参数组</param>
    /// <returns>过滤后的参数组</returns>
    public static Dictionary<string, string> FilterPara(SortedDictionary<string, string> dicArrayPre)
    {
        Dictionary<string, string> dicArray = new Dictionary<string, string>();
        foreach (KeyValuePair<string, string> temp in dicArrayPre)
        {
            if (temp.Key != "sign" && !string.IsNullOrEmpty(temp.Value))
            {
                dicArray.Add(temp.Key, temp.Value);
            }
        }

        return dicArray;
    }

    //组合参数数组
    public static string CreateLinkString(Dictionary<string, string> dicArray)
    {
        StringBuilder prestr = new StringBuilder();
        foreach (KeyValuePair<string, string> temp in dicArray)
        {
            prestr.Append(temp.Key + "=" + temp.Value + "&");
        }

        int nLen = prestr.Length;
        prestr.Remove(nLen - 1, 1);

        return prestr.ToString();
    }

    //加密
    public static string GetMD5(string pwd)
    {
        MD5 md5Hasher = MD5.Create();

        byte[] data = md5Hasher.ComputeHash(Encoding.UTF8.GetBytes(pwd));

        StringBuilder sBuilder = new StringBuilder();
        for (int i = 0; i < data.Length; i++)
        {
            sBuilder.Append(data[i].ToString("x2"));
        }

        return sBuilder.ToString();
    }

5：向员工付款

string _req_data = "<xml>";
        _req_data += "<appid>" + APPID + "</appid>";
        _req_data += "<mch_id>" + PARTNER + "</mch_id>";
        _req_data += "<nonce_str>" + wx_nonceStr + "</nonce_str>";
        _req_data += "<sign>" + get_sign + "</sign>";
        _req_data += "<partner_trade_no>" + Bill_No + "</partner_trade_no>";
        _req_data += "<openid>" + toOpenid + "</openid>";
        _req_data += "<check_name>NO_CHECK</check_name>";
        _req_data += "<amount>" + total_fee + "</amount>";
        _req_data += "<desc>" + title + "</desc>";
        _req_data += "<spbill_create_ip>101.132.79.228</spbill_create_ip>";
        _req_data += "<workwx_sign>" + get_workwx_sign + "</workwx_sign>";
        _req_data += "<ww_msg_type>" + "NORMAL_MSG" + "</ww_msg_type>";
        _req_data += "<act_name>" + title + "</act_name>";
        _req_data += "</xml>";
        
        var result = PostPage(url, _req_data.Trim());

PostPage方法：涉及需要认证微信支付商户号中的证书。
首先：证书需要放到服务器上

/// <summary>
    /// post微信请求
    /// </summary>
    /// <param name="posturl"></param>
    /// <param name="postData"></param>
    /// <returns></returns>
    public static string PostPage(string posturl, string postData)
    {
        Stream outstream = null;
        Stream instream = null;
        StreamReader sr = null;
        HttpWebResponse response = null;
        HttpWebRequest request = null;
        Encoding encoding = Encoding.UTF8;
        byte[] data = encoding.GetBytes(postData);
        // 准备请求...  
        try
        {

            //CerPath证书路径
            string certPath = string.Format(@"D:	estsslcertapiclient_cert.p12");

            //证书密码(初始为商户号)
            string password = "88888888";

            X509Certificate2 cert = new System.Security.Cryptography.X509Certificates.X509Certificate2(certPath, password, X509KeyStorageFlags.MachineKeySet);

            // 设置参数  
            request = WebRequest.Create(posturl) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            request.ContentType = "text/xml";
            request.ContentLength = data.Length;
            request.ClientCertificates.Add(cert);
            outstream = request.GetRequestStream();
            outstream.Write(data, 0, data.Length);
            outstream.Close();
            //发送请求并获取相应回应数据  
            response = request.GetResponse() as HttpWebResponse;
            //直到request.GetResponse()程序才开始向目标网页发送Post请求  
            instream = response.GetResponseStream();
            sr = new StreamReader(instream, encoding);
            //返回结果网页（html）代码  
            string content = sr.ReadToEnd();
            string err = string.Empty;
            return content;

        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }

最后，因为微信支付开发调试不方便，所以提供txt方式的Log方法

    public class Log
    {
        public static void DBLog(string strMemo)
        {
            LogBase("Error.txt", "
" + DateTime.Now.ToString() + "  " + strMemo);
        }
        public static void DBLog(string sql, string strMemo)
        {
            LogBase("Error.txt", "
" + DateTime.Now.ToString() + " " + strMemo + "
SQL:" + sql);
        }
        public static void WriteLog(string strMemo)
        {
            LogBase("Log.txt", strMemo);
        }
        public static void LogBase(string fileName, string str)
        {
            string filename = "D:/blwxtest/" + fileName;
            if (!Directory.Exists("D:/blwxtest/"))
                Directory.CreateDirectory("D:/blwxtest/");
            StreamWriter sr = null;
            try
            {
                if (!File.Exists(filename))
                {
                    sr = File.CreateText(filename);
                }
                else
                {
                    sr = File.AppendText(filename);
                }
                sr.WriteLine(str);
            }
            catch
            {
            }
            finally
            {
                if (sr != null)
                    sr.Close();
            }
        }
    }