"PAN" is an acronym for primary account number, i.e., the "card number" on either a debit or a credit card. PAN truncation simply replaces the card number printed on a customer receipt with a printout of only the last four digits, the remainder being replaced usually by asterisks. This hides the card number from anyone who obtains the receipt when discarded, or by other means, while still allowing a card holder with multiple cards to identify which was used, and thus accurately record the transaction.
PAN truncation is a measure to combat credit card fraud (and debit card fraud), which is increasing worldwide, particularly in a global market where card not present (CNP) transactions are increasingly popular over the Internet, by mail, and by telephone.
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- Margaret Rouse. "PAN truncation (primary account number)". techtarget.com.