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Код

    class Api
    {
        const string Host = "mydomain.megaplan.ru";
        const string BaseUrl = "http://" + Host;
        const string ContentType = "application/x-www-form-urlencoded";

        private Login Login { get; set; }

        public Api(string username, string password)
        {
            Login = GetLogin(username, GetMd5Hash(password));
        }

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

        static string GetMd5Hash(string input)
        {
            using (MD5 md5Hash = MD5.Create())
            {
                byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(input));
                return BytesToHex(data);
            }
        }

        public T Execute<T>(RestRequest request) where T : new()
        {
            var client = new RestClient(BaseUrl);
            var response = client.Execute<T>(request);
            if (response.ErrorException != null)
            {
                const string message = "Error retrieving response.  Check inner details for more info.";
                var exception = new ApplicationException(message, response.ErrorException);
                throw exception;
            }
            return response.Data;
        }

        private Login GetLogin(string login, string passwordMd5)
        {
            var request = new RestRequest();
            request.Resource = "/BumsCommonApiV01/User/authorize.api";
            request.RootElement = "data";
            request.AddParameter("Login", login);
            request.AddParameter("Password", passwordMd5);
            return Execute<Login>(request);
        }

        private string GetXAuthHeader(string signature, string accessId, string secretKey)
        {
            var cryptoProvider = new HMACSHA1(Encoding.UTF8.GetBytes(secretKey));
            byte[] encriptedBytes = cryptoProvider.ComputeHash(Encoding.UTF8.GetBytes(signature));
            string encryptedString = encriptedBytes.Aggregate("", (s, e) => s + String.Format("{0:x2}", e), s => s);
            return accessId + ":" + Convert.ToBase64String(Encoding.UTF8.GetBytes(encryptedString));
        }
        
        private void SignRequest(RestRequest request)
        {
            DateTime requestDate = DateTime.UtcNow;
            string requestDateRfc = requestDate.ToString("r", CultureInfo.InvariantCulture);
            string signhost = Host + request.Resource;
            string signature = string.Join("\n",
                new string [] { request.Method.ToString(), "", ContentType, requestDateRfc, signhost });
            
            string xAutHeader = GetXAuthHeader(signature, Login.AccessId, Login.SecretKey);

            request.AddHeader("Accept-Encoding", "identity");
            request.AddHeader("Accept", "application/json");
            request.AddHeader("User-Agent", "SdfApi_Request");
            request.AddHeader("Date", requestDateRfc);
            request.AddHeader("X-Authorization", xAutHeader);
        }

        public Client FindClient(string phone)
        {
            var request = new RestRequest();
            request.Resource = "/BumsCrmApiV01/Contractor/list.api";
            request.Method = Method.GET;
            request.RootElement = "data";
            request.AddParameter("FilterId", "all");
            request.AddParameter("Limit", "1");
            request.AddParameter("Phone", "223322");

            SignRequest(request);

            return Execute<Client>(request);
        }

    }