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What is a CVV Code?

American Express CVV Code

Visa/MasterCard/Discover CVV Code
CVV is a anti-fraud security feature designed to verify that you are in possession of your credit card. For American Express, the four-digit CVV code is printed on the front of the card above the card account number. For Visa/Mastercard, the three-digit CVV code is printed on the signature panel on the back of the card, immediately after the card's account number.