Card security code
A card security code is a unique three or four-digit number printed on your debit or credit card. The number is not embossed on the card so that it cannot be printed on receipts, making it difficult for anyone other than the genuine cardholder to know it.
On most UK-issued cards, the security code is a three-digit number printed at the top right of the signature strip on the reverse of the card.
Other cards, American Express cards for example, have a four-digit security code printed on the front of the card, above the account number.
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