public static (Amount paid, Money remaining) Pay(this Money money, Amount expense)
{
switch (money)
{
case CashProxy proxy:
(Amount partPaid, Money partRemaining) =
proxy.Implementation.Pay(expense.Scale(1 + proxy.PercentageFee));
return(partPaid.Scale(1 - proxy.PercentageFee), partRemaining);
default:
return(Finance.MoneyPaymentExtensions.Pay(money, expense));
}
}
public Amount ApplyTo(Amount price) => price.Scale(1 + this.Relative);