CVC2 / CVV2 check is an important security feature for card-not-present transactions. The CVV2 /CVC2 is a three-digit number on Visa/MasterCard cards, four-digit on Amex credit cards and printed on the signature panel on the back of credit cards.
The CVV2 value helps to validate two things: The customer has their credit card in his/her possession and the card account is legitimate.
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