The security code is a new security feature for credit cards. All newly issued credit cards feature an additional three-digit number that appears after the card number on the back of the card. On American Express cards, the number is four digits long and appears on the front of the card. These numbers appear on the credit card and are stored in the credit card company's database. This security code can be used to verify that the customer is the true cardholder.
Three-digit code after the last four
digits of your credit card number on the back of the card within the
signature field.
Please be careful not to enter the last three digits of your credit card
number, or your card may not be accepted.
Four-digit number on the front of the
card in the right hand corner above the card number.