using System;

using System.Linq;

using System.Net.Http;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var client = new HttpClient(new HttpClientHandler { UseProxy = false });

        var request = new HttpRequestMessage(HttpMethod.Post, document.Url);

        request.Content = new StringContent(JsonConvert.SerializeObject(workOrderStatusChangeEvent), Encoding.UTF8, "application/json");

​

        var encoding = new System.Text.ASCIIEncoding();

        byte[] keyByte = encoding.GetBytes(document.Secret);

        byte[] messageBytes = encoding.GetBytes(request.Content.ToString());

        using (var hmacsha256 = new HMACSHA256(keyByte))

        {

            byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);

            request.Headers.Add("Sign-Data", Convert.ToBase64String(hashmessage));

        }

        Log.Information($"Sending post request to {request.RequestUri}.");

        HttpResponseMessage response = await client.SendAsync(request);

        Log.Information($"Response received {response.StatusCode}.");

    }

}