The card security code
is a special code feature of your credit card to provide added security for
your transaction. It is a 3 or 4 digit number which is not part of your
credit card number. It appears only on your credit card and provides some
assurance the card is in your possession.
Discover®, Visa® and MasterCard® have the code in the last 3 digits of the number printed on the back of the card in the signature field (see example below on the left).
American Express® has 4 digits printed on the front of the credit card on the right side above the imprinted card number (see example below on the right).
See the security code on the sample cards.