Simple C# script using native HTTP Request handler (HttpWebRequest) to access /api/v2/tickets/{{ticket.id}}.json enpoint.

HTTPWebRequestZD

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Collections.Specialized;

namespace test2
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://{{subdomain}}.zendesk.com/api/v2/tickets/{{###}}.json");
			request.Credentials = new NetworkCredential("{{email_address}}/token", "{{APITOKEN}}");
			request.Method = WebRequestMethods.Http.Get;
			request.AllowAutoRedirect = true;
			request.Proxy = null;
			HttpWebResponse response = (HttpWebResponse)request.GetResponse();
			Stream stream = response.GetResponseStream();
			StreamReader streamreader = new StreamReader(stream);
			string s = streamreader.ReadToEnd();
			Console.Write (s);
		}
	}
}

everything with {{reference}} is a placeholder and should be replaced with the correct value.