Here is a snapshot: Visa Three numbers Back of the card CVV2 Mastercard Three numbers Back of the card CVC and CVC2 American Express Four numbers Front of the card CID number and CSC Discover ...

The credit card verification code (CVC) is used by merchants for transactions that occur over the Internet, by mail, by fax, or over the phone. The CVC is the 3-digit code found on the back of a Visa, ...