Card Verification Value (CVV) is 3 or 4 digit unique number at the back of the credit card. In some cards, the CVV number may also be written on the front of the card, above the card number.

Card Verification Value (CVV) is 3 or 4 digit unique number at the back of the credit card. In some cards, the CVV number may also be written on the front of the card, above the card number.