A card verfication value (CVV) or Card Identification number (CID) is a 3- or 4-digit number found on your credit card. We require this number as an added security precaution.
Where is my CVV?
On Visa, MasterCard and Discover cards, the the CVV is a 3-digit number immediately following your credit card account number
on the back of the card. On American Express cards, the CVV is a 4-digit number located above your credit card account number on the
front of the card.