The Card ID is a 3 or 4 digit security code that is printed on the back of your Visa, MasterCard, Discover or American Express Card. The number appears on the authorized signature after the last four digits of your account number.

If you are using an American Express Card, then the number is 4-digits and is located on the FRONT of the card slightly above and to the right of the end of your card number.

The Authorized Signature may contain your entire account number or just the last four digits of your account number. Either way, the Card ID will appear after the last four digits of your account number. The Card ID is used to verify that you have possession of the credit card you are attempting to use.