public ActionResult Configure()
        {
            var model = new ConfigurationModel();
            model.publicKey = _PayMillPaymentSettings.publicKey;
            model.privateKey = _PayMillPaymentSettings.privateKey;
            model.apiUrl = _PayMillPaymentSettings.apiUrl;

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

            //save settings
            _PayMillPaymentSettings.publicKey = model.publicKey;
            _PayMillPaymentSettings.privateKey = model.privateKey;
            _PayMillPaymentSettings.apiUrl = model.apiUrl;
            _settingService.SaveSetting(_PayMillPaymentSettings);

            return View("Nop.Plugin.Payments.PayMill.Views.PaymentPayMill.Configure", model);
        }