create-request.cs

//Common testing requirement. If you are consuming an API in a sandbox/test region, uncomment this line of code ONLY for non production uses.
//System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

//Be sure to run "Install-Package Microsoft.Net.Http" from your nuget command line.
using System;
using System.Net.Http;

var baseAddress = new Uri("https://private-anon-6009d9f50c-pactsafe.apiary-mock.com/");

using (var httpClient = new HttpClient{ BaseAddress = baseAddress })
{

  
  httpClient.DefaultRequestHeaders.TryAddWithoutValidation("authorization", "Bearer {access_token}");
  
    using (var content = new StringContent("{  \"name\": \"New Request\",  \"description\": \"This is an internal description of the request\",  \"subject\": \"Subject line for email\",  \"message\": \"Message to signers\",  \"signing_order\": false,  \"invite_only\": true}", System.Text.Encoding.Default, "application/json"))
    {
      using (var response = await httpClient.PostAsync("undefined", content))
      {
        string responseData = await response.Content.ReadAsStringAsync();
      }
  }
}