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AMEX A four digit non-embossed number on the face of the card, just above the embossed account number. | ||||
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Discover A three digit non-embossed number on the back of the card printed within the signature panel after the account number.
Mastercard | A three digit non-embossed number on the back of the card printed within the signature panel after the account number.
VISA | A three digit non-embossed number on the back of the card printed within the signature panel after the account number. |