private static void ValidatePin(VirtualCashCard virtualCashCard, ushort cardPin)
{
if (!virtualCashCard.ValidatePin(cardPin))
{
throw new InvalidOperationException("Invalid Card Pin");
}
}
public decimal Withdraw(VirtualCashCard virtualCashCard, ushort cardPin, decimal amount)
{
ValidatePin(virtualCashCard, cardPin);
ValidateAmount(amount);
return(virtualCashCard.Withdraw(amount));
}
public decimal GetBalance(VirtualCashCard virtualCashCard, ushort cardPin)
{
ValidatePin(virtualCashCard, cardPin);
return(virtualCashCard.GetBalance());
}
public bool TopUp(VirtualCashCard virtualCashCard, ushort cardPin, decimal amount)
{
ValidatePin(virtualCashCard, cardPin);
ValidateAmount(amount);
return(virtualCashCard.TopUp(amount));
}