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namespace StudentExam.Model
{
    public class TypingViewModel
    {
        public string id { get; set; }
        public bool OK { get; set; }
        public bool authenticated { get; set; }
        public int score { get; set; }

    }

    public class TypingEnrolViewModel
    {
        public string user_id { get; set; }
        public List<string> samples { get; set; }
    }
}

 private static bool Enroll(string dna, string typingId)
{
    TypingEnrolViewModel request = new TypingEnrolViewModel();
    request.samples = new List<string>();

    request.user_id = typingId;
    request.samples.Add(dna);

    string jsonObject = new JavaScriptSerializer().Serialize(request);

    HttpResponse<String> response = Unirest.post("https://api.keytrac.net/anytext/enrol")
     .header("Authorization", "XXXXX")
     .header("Content-Type", "application/json")
     .body(jsonObject)
     .asJson<String>();


    var result = response.Body;
    var results = JsonConvert.DeserializeObject<TypingViewModel>(response.Body);

    return results.OK;
}