Выбор способа интеграции с Creatio

using System;
using System.Text;
using System.IO;
using System.Net;
using System.Collections.Generic;
using Terrasoft.Nui.ServiceModel.DataContract;
using Terrasoft.Core.Entities;
using System.Web.Script.Serialization;

namespace DataServiceInsertExample
{
    class Program
    {
        private const string baseUri = @"http://userapp.сreatio.com";
        private const string authServiceUri = baseUri + @"/ServiceModel/AuthService.svc/Login";
        private const string insertQueryUri = baseUri + @"/0/DataService/json/reply/InsertQuery";
        private static CookieContainer AuthCookie = new CookieContainer();

        private static bool TryLogin(string userName, string userPassword)
        {
            bool result = false;
            // TODO: Реализация аутентификации.
            return result;
        }

        static void Main(string[] args)
        {
            if (!TryLogin("User1", "User1"))
            {
                return;
            }
            // Формирование JSON-объекта для запроса на добавление данных.
            // Используется контракт данных InsertQuery.
            var insertQuery = new InsertQuery()
            {
                RootSchemaName = "Contact",
                ColumnValues = new ColumnValues()
            };
            var columnExpressionName = new ColumnExpression
            {
                ExpressionType = EntitySchemaQueryExpressionType.Parameter,
                Parameter = new Parameter
                {
                    Value = "Иванов Иван Иванович",
                    DataValueType = DataValueType.Text
                }
            };
            var columnExpressionPhone = new ColumnExpression
            {
                ExpressionType = EntitySchemaQueryExpressionType.Parameter,
                Parameter = new Parameter
                {
                    Value = "+12 345 678 00 00",
                    DataValueType = DataValueType.Text
                }
            };
            var columnExpressionJob = new ColumnExpression
            {
                ExpressionType = EntitySchemaQueryExpressionType.Parameter,
                Parameter = new Parameter
                {
                    Value = "11D68189-CED6-DF11-9B2A-001D60E938C6",
                    DataValueType = DataValueType.Guid
                }
            };
            insertQuery.ColumnValues.Items = new Dictionary<string, ColumnExpression>();
            insertQuery.ColumnValues.Items.Add("Name", columnExpressionName);
            insertQuery.ColumnValues.Items.Add("Phone", columnExpressionPhone);
            insertQuery.ColumnValues.Items.Add("Job", columnExpressionJob);
            var json = new JavaScriptSerializer().Serialize(insertQuery);
            byte[] jsonArray = Encoding.UTF8.GetBytes(json);
            
            // Отправка Http-запроса.
            var insertRequest = HttpWebRequest.Create(insertQueryUri) as HttpWebRequest;
            insertRequest.Method = "POST";
            insertRequest.ContentType = "application/json";
            insertRequest.CookieContainer = AuthCookie;
            insertRequest.ContentLength = jsonArray.Length;
            using (var requestStream = insertRequest.GetRequestStream())
            {
                requestStream.Write(jsonArray, 0, jsonArray.Length);
            }
            using (var response = (HttpWebResponse)insertRequest.GetResponse())
            {
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    Console.WriteLine(reader.ReadToEnd());
                }
            }
        }
    }
}

POST /0/odata/Contact HTTP/1.1
Host: mycreatio.com
Accept: application/json
Content-Type: application/json; charset=utf-8
ForceUseSession: true
BPMCSRF: OpK/NuJJ1w/SQxmPvwNvfO
Content-Type: application/json

{
    // Добавить в поле Name значение New User.
    "Name": "New User",
    // Добавить в поле JobTitle значение Customer manager.
    "JobTitle": "Customer manager"
}

namespace Terrasoft.Configuration.CustomConfigurationService
{
    using System;
    using System.ServiceModel;
    using System.ServiceModel.Web;
    using System.ServiceModel.Activation;

    [ServiceContract]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
    public class CustomConfigurationService
    {
        [OperationContract]
        [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped,
        ResponseFormat = WebMessageFormat.Json)]
        public string GetTransformValue(string inputParam)
        {
            // Изменение значения входящего параметра.
            var result = inputParam + " changed!";
            return result;
        }
    }
}