public static SessionKeyModel LoginUser(string username, string authCode)
 {
     string loginUrl = "users/login";
     UserModel user = new UserModel
     {
         Username = username,
         Password = authCode
     };
     var response = requester.Post<SessionKeyModel>(loginUrl, user);
     return response;
 }
 public static SessionKeyModel RegisterUser(string username, string authCode)
 {
     string registerUrl = "users/register";
     UserModel user = new UserModel
     {
         Username = username,
         Password = authCode
     };
     var response = requester.Post<SessionKeyModel>(registerUrl, user);
     return response;
 }