The security code (CVV/CVC) is a 3 or 4-digit number that provides an extra layer of protection for online transactions.
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Visa, Mastercard, and Discover: It is a 3-digit number located on the back of your card, usually to the right of the signature strip.
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American Express: It is a 4-digit number located on the front of the card, just above the main credit card number.
This code ensures that the person placing the order has the physical card in their possession.