public void pay(int clientId, String status, int amount)
        {
            if ("success".Equals(status))
            {
                Korisnik user = db.Korisniks.Find(clientId);
                if (user.tokeni == null)
                {
                    user.tokeni = amount;
                }
                else
                {
                    user.tokeni += amount;
                }
                using (var dbc = new Model1())
                {
                    dbc.Entry(user).State = System.Data.Entity.EntityState.Modified;
                    dbc.SaveChanges();
                }


            }

        }