Your Security Code/CID (Card Identification Number) is in the signature area on the back of the card (it is the last 3 digits AFTER the credit card account number). Visa/MC/Discover customer CIDS are 3 digits.
Back of Visa/MC/Discover Card
Your Security Code/CID (Card Identification Number) is a 4-digit number on the front of the card, ABOVE the embossed (raised) credit card account number. This number is referred to as the "Security Code." American Express customer CIDs are 4 digits.
Front of American Express Card
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