Most credit cards now include a 3 or 4 digit verification number, which
is not part of the regular credit card number. CVD seeks to ensure that
the purchaser has the physical card in hand when placing a phone, mail,
or Internet order, and to verify that the card account is legitimate. The
number is not contained in the magnetic strip information nor does it appear
on sales receipt.
For most cards, the CVD number is a three digit number on the back of
the card.
