public List<UserRanking> GetUsersWithTopScores (int numberOfUsersToReturn, Action<bool> dataArrived)
    {
        ServicePointManager.ServerCertificateValidationCallback = delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };

        HttpWebRequest request = (HttpWebRequest) WebRequest.Create(String.Format(LEADERBOARD_GET + "?number_of_results={0}", numberOfUsersToReturn));

        HttpWebResponse response = (HttpWebResponse) request.GetResponse();

        if (response.StatusCode == HttpStatusCode.OK)
        {
            StreamReader reader = new StreamReader(response.GetResponseStream());

            string jsonResponse = reader.ReadToEnd();

            jsonResponse = "{\"Results\":" + jsonResponse.ToString() + "}";

            UserRankingResult userRankings = JsonUtility.FromJson<UserRankingResult>(jsonResponse);

            dataArrived(true);

            return userRankings.Results;

        } else
        {
            Debug.Log("We have an error");

            dataArrived(false);

            // return empty list
            return new List<UserRanking>();
        }
    }