static void Main(string[] args) { var paymentClient = new PaymentClient(new PaypalPaymentService()); var totalAmount = paymentClient.MakePayment(100); Console.WriteLine("Total Amount: " + totalAmount); paymentClient.ChangeStrategy(new LocalBankPaymentService()); totalAmount = paymentClient.MakePayment(100); Console.WriteLine("Total Amount: " + totalAmount); Console.ReadLine(); }