What is the Card Security
Code?
The Card Security Code is an additional security measure printed on
all credit cards.
Here's how to find it on your card:
Visa, MasterCard, Discover Cards:
3-digit, non-embossed number printed on the signature panel on the
back of the card immediately following the card account number.
Amex Card:
4 digit, non-embossed number printed above your
account number on the face of your card.