The security code for MasterCard (CVC2), Visa (CVV2), and Discover (CID2), can be located on the back signature panel of the card, to the right of the signature area. It should be a flat, 3 digit code, not embossed like the numbers on the front of the card.
The security code, or CID for American Express, is a four-digit code printed on the front side of the card above the number. The number should be printed flat, and not embossed like the card number.
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