The CVV2 number must be printed on all new and re-issued cards issued after January 1, 1998.
The CVV2 number must be printed on all cards as of June 30, 1999

Note: The CVV2 numbers are the 3 digits that appear at the end of the credit card number on the back of VISA and the 4 digits that appear on the front of the American Express card above the last 4 digits of the card number