static void Main(string[] args)          {

            Dictionary<string, string> dict = new Dictionary<string, string>();

            string result = Send("SCM_IHS_TransportOrderService", "1.0.0", dict);

        }

 static String Send(String apiName, String apiVersion, Dictionary<String, String> dict)

        {   

            HttpWebRequest request = WebRequest.Create(URL) as HttpWebRequest;

            request.Method = "POST";

            request.ContentType = "application/json";

dict.Add("_api_access_key", AK);

            dict.Add("_api_name", apiName);

            dict.Add("_api_version", apiVersion);

            dict.Add("_api_timestamp", timestamp);

  }