public PaymentMethodsProvider(IModelTracker<PaymentMethodModel> paymentMethodsTracker)
 {
     this.paymentMethodsTracker = paymentMethodsTracker;
 }
 public DeliveryMethodsProvider(IModelTracker<DeliveryMethodModel> deliveryMethodsTracker)
 {
     this.deliveryMethodsTracker = deliveryMethodsTracker;
 }