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Visa, Mastercard, Discover
The security code is located on the back of your card, inside the signature area. Typically the signature panel will have a series of numbers, but only the last three digits make up the security code.
American Express
The security code is ALWAYS located ABOVE the embossed (raised) account number on the face of the card. In some instances, the security code is located on the left side of the card, but is always above the account number.