public Card(string cardNumber, string expiry, int securityCode, string accountHolder)
{
CardNumber = new CardNumber(cardNumber);
ExpiryDate = new MonthYear(expiry);
SecurityCode = CardNumberLogic.ParseSecurityCode(securityCode);
AccountHolderName = accountHolder;
}
public CardNumber(string cardNumber)
{
Digits = CardNumberLogic.CreateCardNumberByteArray(cardNumber);
}