What does 'security code' mean when booking with a credit card?

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Q: What does 'security code' mean when booking with a credit card?

A: The security code can usually be found on the signature strip on the back of most cards. In most cases the security code is the last 3 digits printed on this signature strip. However, with American Express cards, the security code is the four digits printed just above the card number on the front of the card.

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