CVV Number (“Card Verification Value”) is a 3-digit number available on the back of your credit/debit (VISA®, MasterCard®) card. On American Express® branded credit or debit card it is a 4-digit numeric code located on the front of the card. This code is often used for verification purposes, especially for online purchases to prevent fraud. Providing the CVV number implies that the person placing the order has physical possession of the card.