public ICreditCardAccountSummary Create(CardNumber accountNumber, CardSecurityNumber sortCode, String accountName, Decimal accountBalance, Decimal accountAvailable, AccountType accountType)
 {
     return new CreditCardAccountSummary(accountNumber, sortCode)
     {
         AccountName = accountName,
         AccountBalance = accountBalance,
         AccountAvailable = accountAvailable,
         AccountType = accountType
     };
 }
 public CreditCardAccountSummary(CardNumber cardNumber, CardSecurityNumber cardSecurityNumber)
 {
     throw new NotImplementedException();
 }