CVV2# Location on VISA, MasterCard and Discover Credit Cards:
The CVV2 is a three-digit number printed on the signature panel on the back of Visa, Mastercard & Discover cards immediately following the credit card account number.

CID# Location on AMERICAN EXPRESS cards:
The Card Identification # 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.