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

            return View("Nop.Plugin.Payments.PayInStore.Views.PaymentPayInStore.Configure", model);
        }
        public ActionResult Configure(ConfigurationModel model)
        {
            if (!ModelState.IsValid)
                return Configure();

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

            return View("Nop.Plugin.Payments.PayInStore.Views.PaymentPayInStore.Configure", model);
        }