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();
}