PeytzMailFetchUnsubscribes.cs

using System;
using System.IO;
using System.Net;
using static System.Console;

public static class Program
{
    static void Main()
    {
      WebClient client = new WebClient ();

      string pmClient = "peytzmail-subdomain", mailinglistId = "mailing-list-id", startCriteria = "period_start=2017-11-01", userEmail = "api-user%40example.com", userToken = "sEcr3t";

      // start_criteria can either be a date 'period_start=yyyy-mm-dd' or an id 'from_id=someEventId'.
      // Save the last id from one request and use it in from_id in the next to get a continuous set of events
      string url = String.Format("https://{0}.peytzmail.com/api/v1/subscriber_events/mailinglists/{1}.json?changes[]=unsubscribe&{2}&user_email={3}&user_token={4}",
        pmClient, mailinglistId, startCriteria, userEmail, userToken
      );
      string reply = client.DownloadString (url);

      Console.WriteLine (reply);
      Console.ReadLine();
    }
}