static void Main()
        {
            var paymentTerminal = new PaymentTerminal();

            try
            {
                // Vending Machine Out Of Service
                var pringlesItem = ProductFactory.CreatePringlesProduct();
                ProductBand.Instance().Add(pringlesItem);
                var dispenser = new Dispenser();
                paymentTerminal.Attach(dispenser);
            }
            catch (Exception exception)
            {
                if (exception is BandIsFullException)
                {
                    Console.WriteLine("Band is full! It can't store any items.");
                }
            }

            try
            {
                // New Customer Requests for a Pringles
                var visaCard = new CreditCard("4012888888881881");
                paymentTerminal.Pay(visaCard, 1, "Pringles");
            }
            catch (Exception exception)
            {
                if (exception is FormatException)
                {
                    Console.WriteLine("You entered a wrong value! Press any key and try again!");
                }
                if (exception is CardNotValidException)
                {
                    Console.WriteLine("This credit card is not valid! Try another payment method.");
                }
                if (exception is CardNotFoundException)
                {
                    Console.WriteLine("Card was not found! Payment canceled!");
                }
                if (exception is BandIsEmptyException)
                {
                    Console.WriteLine("Band is empty! You can't {0} any item!", exception.Message);
                }
            }

            Console.ReadKey();
        }