public JsonResult InvokeDeposit(long accountNumber, decimal amount, string currency)
        {
            var result = ur.InvokeDeposit(accountNumber, amount, currency);

            var deposit = new BalanceViewModel
            {
                AccountNumber = result.AccountNumber,
                Balance       = result.Balance,
                Currency      = result.Currency,
                Successful    = result.Successful,
                Message       = result.Message
            };

            return(Json(deposit, JsonRequestBehavior.AllowGet));
        }