Credit card numbers are used to identify the card network ... your card will also have a three- or four-digit number either on the front or back. This number can be called the CVV, CVC, CVC2 ...

THEY ASK YOU TO VERIFY THAT YOU ACTUALLY HAVE YOUR CARD IN YOUR POSSESSION IN FRONT OF YOU ... TAKE OUT YOUR CREDIT CARD AND FLIP IT OVER AND CALL THE NUMBER ON THE BACK OF THE CARD TO CONFIRM ...