A Card Verification Value code, CVV, (CVV2 for Visa, CVC2 for MasterCard and CID for AMEX) is the three or four digit number located either on the front or back of a credit or debit card. Merchant's can request the CVV code from card holders as another way to screen fraudulent transactions. The idea is that someone using a stolen credit card is less likely to have this code so they will be unable