The card security
code (CSC) is usually a 3 - or 4 - digit number, which is not part of
the credit card number. The CSC is typically printed on the back of a
credit card (usually in the signature field).
On some cards, all or part of the card number appears before
the CSC, for example, 1234 567. In this example, 1234 are the last four
digits of the credit card number, and 567 is the CSC.
The number appears only on the card itself (not on receipts or
statements)
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