protected async override Task <object> OnPerform()
        {
            var contract = new
            {
                saleNumber = _cacheManager.SaleNumber,
                tillNumber = _cacheManager.TillNumber
            };

            var content = new StringContent(JsonConvert.SerializeObject(contract)
                                            , Encoding.UTF8, ApplicationJSON);
            var response = await _checkoutRestClient.PumpTest(content);

            var data = await response.Content.ReadAsStringAsync();

            switch (response.StatusCode)
            {
            case HttpStatusCode.OK:
                var paymentComplete = new DeSerializer().MapCommonCompletePayment(data);
                return(new Mapper().MapCommonCompletePayment(paymentComplete));

            default:
                return(await HandleExceptions(response));
            }
        }