public static async Task <PaypalOrder> CheckoutWithCreditCard(this ShoppingCart shoppingCart, PaypalInfo paypalInfo, string discountCode)
{
await Task.Delay(3000); // simulate pappal info verification
return(new PaypalOrder(shoppingCart, paypalInfo));
}
public PaypalOrder(ShoppingCart shoppingCart, PaypalInfo payPalInfo) : base(shoppingCart)
{
PayPalInfo = PayPalInfo;
}