淘宝客根据优惠券url更新优惠券信息

            string m_h5_tk = "6ad772f2d0833a8e302c5ae68d65eaa0";
            string time = ToUnixTimestampBySeconds().ToString();
            string appKey = "12574478";
            string data = JsonConvert.SerializeObject(new { e = "w4TDo/jOMecNfLV8niU3RxrSI/Oabn6qNg4Gqf8CT4AKuDLwELihnRbQhr+5FtsAh9KaCsCm+R32yVMpbbWtUWwCdh1fz0zYK5wEWaT+OkzWZTH/haUuJ+3FJUPORYvyhPbd0JgRLDq3GXpSbfs48lGikzdUqsEO7RwD1Eg9p5/o27RMW2YwFNweCPWKo1fUyUxONJCwrinluAYBRglsbQ==" });
            string sign = GetSign(string.Join('&', new string[] { m_h5_tk, time, appKey, data }));
            data = HttpUtility.UrlEncode(data);
            string apiUrl = $"https://acs.m.taobao.com/h5/mtop.alimama.union.hsf.coupon.get/1.0/?jsv=2.4.0&appKey=12574478&t={time}&sign={sign}&api=mtop.alimama.union.hsf.coupon.get&v=1.0&AntiCreep=true&AntiFlood=true&data={data}";

　m_h5_tk为访问mtop.alimama.union.hsf.coupon.get接口链接时，返回的cookies数据，注，返回cookies数据格式为：_m_h5_tk= 1c08cb77a7795d64c543cd1728e0135c_1529065507043，这里只使用前半部分，在这里是1c08cb77a7795d64c543cd1728e0135c；

   time为毫秒级时间戳；

   appKey为固定的值12574478；

   data为json字符串，e为优惠券url中的参数e的值；

　sign签名

   

        /// <summary>
        ///  时间转时间戳Unix-时间戳精确到秒
        /// </summary> 
        private static long ToUnixTimestampBySeconds()
        {
            DateTimeOffset dto = new DateTimeOffset(DateTime.Now);
            return dto.ToUnixTimeMilliseconds();
        }
        private static string GetSign(string strParameter)
        {
            using (var md5 = MD5.Create())
            {

                var result = md5.ComputeHash(Encoding.UTF8.GetBytes(strParameter));
                var strResult = BitConverter.ToString(result);
                var sign = strResult.Replace("-", "").ToLower();
                return sign;
            }
        }