CVV2 (Card Verification Value) codes are a 3 or 4 digit number found on the front or back of your credit/debit card. This code is used for your security by establishing that you are in possession of the card during the time of payment.
If you are using a VISA, MasterCard or Discover Card, the CVV2 code is the last 3 digits found on the signature strip (back of card).
If you are using an American Express, the CVV2 code is a non-embosed 4 digit code found on the front of the card.