|Card Identification Number|
The Credit Card Identification Number is a new authentication scheme
established by credit card companies to further efforts towards reducing
fraud for internet transactions. It consists of requiring a card holder
to enter a 3 or 4 digit number in at transaction time to verify that the
card is on hand.|
For Visa / MasterCard:
The three-digit value is printed on the signature panel on the back of Visa/MasterCard cards immediately following the Visa/MasterCard card account number.
For American Express:
The Card Identification Number is the 4 digit, non-embossed number printed above your account number on the face of your card. This number is recorded as an additional security precaution.