public ActionResult Configure()
        {
            var model = new ConfigurationModel();
            model.DescriptionText = _cashOnDeliveryPaymentSettings.DescriptionText;
            model.AdditionalFee = _cashOnDeliveryPaymentSettings.AdditionalFee;
            model.AdditionalFeePercentage = _cashOnDeliveryPaymentSettings.AdditionalFeePercentage;

            return View("Nas.Plugin.Payments.CashOnDelivery.Views.PaymentCashOnDelivery.Configure", model);
        }
        public ActionResult Configure(ConfigurationModel model)
        {
            if (!ModelState.IsValid)
                return Configure();

            //save settings
            _cashOnDeliveryPaymentSettings.DescriptionText = model.DescriptionText;
            _cashOnDeliveryPaymentSettings.AdditionalFee = model.AdditionalFee;
            _cashOnDeliveryPaymentSettings.AdditionalFeePercentage = model.AdditionalFeePercentage;
            _settingService.SaveSetting(_cashOnDeliveryPaymentSettings);

            return View("Nas.Plugin.Payments.CashOnDelivery.Views.PaymentCashOnDelivery.Configure", model);
        }