V2升级V3 顺便记录一下 ,文档:

！！！

• 支付授权目录与测试人的微信帐号白名单(出现access_denied或access_not_allow错误，请检查是否设置正确)
• 微信签名(用于jssdk调用支付，查询订单，异步参数签名等)
• 数字证书，用于微信退款

 

官方：

参数签名

对所有传入参数按照字段名的ASCII 码从小到大排序（字典序）后，使用URL 键值对的格式（即key1=value1&key2=value2…）拼接成字符串string1，注意：值为空的参数不参与签名 在string1 最后拼接上key=Key( 商户支付密钥) 得到stringSignTemp 字符串， 并对stringSignTemp 进行md5 运算，再将得到的字符串所有字符转换为大写，得到sign 值signValue

/// 
        /// 创建微信Sign        /// 
        /// 微信商户支付密钥        /// 参数字典        /// 
             public string GenerateWxSign(string key, SortedDictionary
     
       dict)        {            try            {                string str = string.Empty;                foreach (var item in dict)                {                    if (item.Key != "sign" && item.Value.ToString() != "")                    {                        str += item.Key + "=" + item.Value + "&";                    }                }                str = str.Trim('&');                //在string后加入API KEY                str += "&key=" + key;                //MD5加密                var md5 = System.Security.Cryptography.MD5.Create();                var bs = md5.ComputeHash(Encoding.UTF8.GetBytes(str));                var sb = new StringBuilder();                foreach (byte b in bs)                {                    sb.Append(b.ToString("x2"));                }                //所有字符转为大写                return sb.ToString().ToUpper();            }            catch (Exception)            {                return string.Empty;            }        }
     

异步通知

基本按照文档来，返回的参数要使用流的方式来读取XML，另外验证参数的合法性可以验证签名或调用一次微信订单查询接口

/// 
    /// 微信支付异步回调控制器【V3版本】    /// 
    public class WeixinController : Controller    {        private static readonly Logger logger = LogManager.GetCurrentClassLogger();        /// 
        /// 订单服务        /// 
        private readonly IOrderService _orderService;        /// 
        /// 微信服务        /// 
        private readonly IWeixinService _weixinService;        /// 
        /// 构造函数        /// 
        /// 订单服务        /// 微信服务        public WeixinController(IOrderService orderService, IWeixinService weixinService)        {            _orderService = orderService;            _weixinService = weixinService;        }        /// 
        /// 微信Wap支付异步通知        /// 
        /// 
             public async Task
     
       Notify()        {            int intLen = Convert.ToInt32(Request.InputStream.Length);            if (intLen <= 0)            {                return Content(AjaxResult.Error("WeixinController NO Wap Notify PARAMS!").ToStringSafe());            }            try            {                var dict = new SortedDictionary
      
       ();                //dict = @"appid=wxqe353dd942e01&attach=F&bank_type=CFT&cash_fee=1&fee_type=CNY&is_subscribe=Y&mch_id=10036766&nonce_str=e9605038cccbffe5ed2b2eb095345d18&openid=oIO3gjsiGqv7eeuAKhbB_V83V528&out_trade_no=68047857&result_code=SUCCESS&return_code=SUCCESS&sign=85A469F874619EAB924FA5B7EB779444&time_end=20150526183632&total_fee=1&trade_type=JSAPI&transaction_id=1001640542201505260168707842".ConvertStringToSortedDictionary();                var xmlDoc = new XmlDocument();                xmlDoc.Load(Request.InputStream);                var root = xmlDoc.SelectSingleNode("xml");                XmlNodeList xnl = root.ChildNodes;                foreach (XmlNode xnf in xnl)                {                    dict.Add(xnf.Name, xnf.InnerText);                }                if (dict.Count <= 0)                {                    return Content(AjaxResult.Error("NO Notify PARAMS!").ToStringSafe());                }                logger.Info("【 WeixinController Wap Notify SDKUtil.ConvertDictionaryToString : 请求报文=[" + dict.ConvertDictionaryToString() + "]\n");                //验证参数签名                string signK = _weixinService.GenerateWxSign(WxPayConfig.KEY, dict);                if (signK != dict["sign"])                {                    logger.Info("WeixinController Wap Notify Verify WxSign Error : 请求报文=[signK " + signK + " : dict['sign'] " + dict["sign"] + "]\n");                    return Content(AjaxResult.Error("WeixinController Wap Notify Verify WxSign Error " + "]\n").ToStringSafe());                }                //验证通信标识                string return_code = dict["return_code"];                if (!return_code.Equals("SUCCESS", StringComparison.OrdinalIgnoreCase))                {                    string return_msg = dict["return_msg"];                    logger.Info("WeixinController Wap Notify return_code Error : 请求报文=[" + return_code + " : " + return_msg + "]\n");                    return Content(AjaxResult.Error("WeixinController Wap Notify return_code Error " + return_code + "]\n").ToStringSafe());                }                //验证交易标识                string result_code = dict["result_code"];                if (!result_code.Equals("SUCCESS", StringComparison.OrdinalIgnoreCase))                {                    string err_code = dict["err_code"];                    string err_code_des = dict["err_code_des"];                    logger.Info("WeixinController Wap Notify return_code Error : 请求报文=[" + err_code + " : " + err_code_des + "]\n");                    return Content(AjaxResult.Error("WeixinController Wap Notify return_code Error " + result_code + "]\n").ToStringSafe());                }                //公众账号ID                string appid = dict["appid"];                //商户号                string mch_id = dict["mch_id"];                //随机字符串                string nonce_str = dict["nonce_str"];                //签名                string sign = dict["sign"];                //用户在商户appid 下的唯一标识                string openid = dict["openid"];                //用户是否关注公众账                string is_subscribe = dict["is_subscribe"];                //交易类型                string trade_type = dict["trade_type"];                //付款银行                string bank_type = dict["bank_type"];                //订单总金额，单位为分                string total_fee = dict["total_fee"];                //金额分转元                string total_fee_rmb = (float.Parse(total_fee) / 100).ToString();                //商户订单号                string out_trade_no = dict["out_trade_no"];                //微信支付订单号                string transaction_id = dict["transaction_id"];                //商家数据包                string attach = dict["attach"];                //支付完成时间                string time_end = dict["time_end"];                //支付方式                string paymethod = attach;               //微信订单查询【使用签名验证废弃】                //var wxorder = await _weixinService.Query(WxPayConfig.KEY, WxPayConfig.APPID, WxPayConfig.MCHID, transaction_id, out_trade_no);               //检查订单是否已经支付                 var order = await _orderService.Query(out_trade_no);               if (order.IsNull() || order.Total_fee.IsNotNullOrEmpty()){                    return Content(AjaxResult.Error("ORDERNO STATUS ERROR !!!").ToStringSafe());               }                //更新支付金额与订单状态                 var orderFlag = await _orderService.Update(crsResv);                if (orderFlag.IsError)                {                    logger.Fatal("WeixinController Wap Notify  Update Order Error  crsResv : " + crsResv.SerializeJson(System.Text.Encoding.UTF8));                    return Json(new { IsError = true, Msg = "更新订单数据错误", Data = string.Empty }, JsonRequestBehavior.AllowGet);                }                //微信支付发货通知                 var wxNotify = await _weixinService.WeixinNotify(openid, transaction_id, out_trade_no);                //记录DB                var save = await _weixinService.Save(wxAsync);                //构造返回成功XML                var wxdict = new SortedDictionary
       
        ();                wxdict.Add("return_code", "SUCCESS");                wxdict.Add("return_msg", "PAY_SUCCESS");                string wxRXml = wxdict.ConvertWxDictToString();                logger.Info("WeixinController Wap Notify  Success wxRXml : " + wxRXml + " 】");                return Content(wxRXml);            }            catch (Exception ex)            {                logger.Fatal("WeixinController Wap Notify Exception : " + ex.Message + " 】", ex);                return Content(AjaxResult.Error("WeixinController Wap Notify Exception").ToStringSafe());            }        }        /// 
        
        /// 字典转微信返回XML        /// 
        /// 
                /// 
                /// 
                /// 
                public static string ConvertWxDictToString
        
         (this IDictionary
         
           wxdict)        {            try            {                string xml = "
          
           "; wxdict.ForEach(wd => { if (wd.Value.GetType() == typeof(int)) { xml += "<" + wd.Key + ">" + wd.Value + "
           "; } else if (wd.Value.GetType() == typeof(string)) { xml += "<" + wd.Key + ">" + "
           "; } }); xml += "
          ";                return xml;            }            catch (Exception)            {                return string.Empty;            }        }
         
        
       
      
     

订单查询

/// 
        /// 微信订单查询         /// 
        /// 公众账号ID        /// 商户号        /// 微信的订单号        /// 商户订单号        /// 随机字符串        /// 签名        /// 
             public async Task
     
       Query(string appid, string mch_id, string transaction_id, string out_trade_no, string nonce_str, string sign)        {            if (appid.IsEmpty() || mch_id.IsEmpty() || transaction_id.IsEmpty())            {                return new WebAPIResponse { IsError = true, Msg = "参数有误！！！" };            }            try            {                var dict = new Dictionary
      
       ();                dict.Add("appid", appid);                dict.Add("mch_id", mch_id);                dict.Add("transaction_id", transaction_id);                dict.Add("out_trade_no", out_trade_no);                dict.Add("nonce_str", nonce_str);                dict.Add("sign", sign);                string xml = "
       
        ";                foreach (var pair in dict)                {                    if (pair.Value.GetType() == typeof(int))                    {                        xml += "<" + pair.Key + ">" + pair.Value + "
        ";                    }                    else if (pair.Value.GetType() == typeof(string))                    {                        xml += "<" + pair.Key + ">" + "
        ";                    }                }                xml += "
       ";                logger.Info("WeixinRepository WeixinNotify Req xml: " + xml);                var data = await @"https://api.mch.weixin.qq.com/pay/orderquery".PostStringAsync(xml).ReceiveString();                logger.Info("WeixinRepository WeixinNotify Resp xml: " + data);                if (data.IsNotNullOrEmpty() && data.Contains("SUCCESS", StringComparison.OrdinalIgnoreCase))                {                    return new WebAPIResponse { IsError = false, Data = "查询订单成功！！！" };                }                return new WebAPIResponse { IsError = true, Msg = "微信订单查询失败！！！" };            }            catch (Exception ex)            {                logger.Error("WeixinRepository WeixinNotify ConvertDictionaryToJson Exception :" + ex.Message, ex);                return new WebAPIResponse { IsError = true, Msg = ex.Message };            }        }
      
     

微信退款

!!!需注意签名与证书

/// 
        /// 微信申请退款V3        /// 
        /// 订单号        /// 
             public bool RefundWxV3(string orderNo)        {            try            {                //查询支付信息                  var orderAsync =await _orderService.Query(orderNo);                var dict = new SortedDictionary
     
      ();                dict.Add("appid", WxPayConfig.APPID);                dict.Add("mch_id", WxPayConfig.MCHID);                dict.Add("nonce_str", ConstantKey.NonceStr);                dict.Add("transaction_id", orderAsync.transaction_id);                dict.Add("out_trade_no", orderAsync.out_trade_no);                dict.Add("out_refund_no", WxPayConfig.GenerateOutTradeNo);                dict.Add("total_fee", orderAsync.total_fee);                dict.Add("refund_fee", orderAsync.total_fee);                dict.Add("op_user_id", WxPayConfig.MCHID);                string sign = GenerateWxSign(WxPayConfig.KEY, dict);                dict.Add("sign", sign);                string xml = "
      
       ";                foreach (var pair in dict)                {                    if (pair.Value.GetType() == typeof(int))                    {                        xml += "<" + pair.Key + ">" + pair.Value + "
       ";                    }                    else if (pair.Value.GetType() == typeof(string))                    {                        xml += "<" + pair.Key + ">" + "
       ";                    }                }                xml += "
      ";                logger.Info("RefundWxV3 Req xml: " + xml);                var data = HttpWxCert(@"https://api.mch.weixin.qq.com/secapi/pay/refund", "POST", xml, "text/xml", isUseCert: true);                logger.Info("RefundWxV3 Resp xml: " + data);                if (data.IsNotEmpty() && data.Contains("SUCCESS", StringComparison.OrdinalIgnoreCase))                {                    return true;                }                return false;            }            catch (Exception ex)            {                logger.Error("CancelResvForWeb RefundWxV3 Exception :" + ex.Message, ex);                return false;            }        }        /// 
      
        /// 创建HTTP请求         /// 
        /// 
      请求URL        /// 
      请求方式        /// 
      请求参数        /// 
      设置HTTP contentType类型        /// 
      是否使用证书        /// 
      请求超时时间        /// 
              public static string HttpWxCert(string url, string method = "GET", string data = null, string contentType = "application/x-www-form-urlencoded", bool isUseCert = false, int timeout = 15000)        {            if (url.IsEmpty())                throw new ArgumentNullException("url");            HttpWebRequest req = null;            HttpWebResponse resp = null;            StreamReader sr = null;            Stream stream = null;            try            {                if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))                {                    System.Net.ServicePointManager.ServerCertificateValidationCallback += (se, cert, chain, sslError) =>                    {                        return true;                    };                }                //设置最大连接数                System.Net.ServicePointManager.DefaultConnectionLimit = 200;                req = (HttpWebRequest)WebRequest.Create(url);                req.Method = method.ToUpper();                req.Timeout = timeout;                req.ContentType = contentType;                //是否使用证书                if (isUseCert)                {                    string pfxPath = WxPayConfig.SSLCERT_PATH;                    logger.Info("wxV3.signCert.path pfxPath : " + pfxPath + " File Exists: " + File.Exists(pfxPath));                    //string path = HttpContext.Current.Request.PhysicalApplicationPath;                    //调用证书                    var cert = new X509Certificate2(pfxPath, WxPayConfig.SSLCERT_PASSWORD, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);                    req.ClientCertificates.Add(cert);                }                if (method.ToUpper() == "POST" && !data.IsEmpty())                {                    byte[] postBytes = UTF8Encoding.UTF8.GetBytes(data);                    req.ContentLength = postBytes.Length;                    using (stream = req.GetRequestStream())                    {                        stream.Write(postBytes, 0, postBytes.Length);                    }                }                resp = (HttpWebResponse)req.GetResponse();                using (sr = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))                {                    return sr.ReadToEnd().Trim();                }            }            catch (Exception ex)            {                logger.Error(string.Format("HttpWxCert Exception url: {0} \r\n data: {1}", url, data), ex);                return string.Empty;            }            finally            {                if (sr != null)                {                    sr.Close();                    sr = null;                }                if (stream != null)                {                    stream.Close();                    stream = null;                }                if (resp != null)                {                    resp.Close();                    resp = null;                }                if (req != null)                {                    req.Abort();                    req = null;                }            }        }
     

Refer:

微信支付接口退款时：System.Security.Cryptography.CryptographicException