Thankfully, you don’t have to memorize your credit ... number, 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 ...

Whether shopping online or over the phone, you must provide your credit card ... Visa Three numbers Back of the card CVV2 Mastercard Three numbers Back of the card CVC and CVC2 American Express ...