9F24

Payment Account Reference is a deliberately non-financial identifier that links every token generated for one underlying account - a mobile wallet token, an e-commerce token, the original physical card - back to each other, without itself being usable to initiate a payment and without exposing the PAN (5A, referenced alongside it) those tokens actually protect. It exists because tokenization solved one problem, never exposing the real PAN across multiple digital channels, while creating another: a merchant or issuer that needs to recognise this is the same underlying account as that other transaction for loyalty, fraud analysis, or dispute purposes previously had no safe way to do that once the PAN itself was hidden behind different tokens in different channels - 9F24 is exactly that safe cross-reference. Related to the Token Requestor ID (9F19) that identifies which entity requested a given token in the first place, PAR is specifically designed so that even a system holding it cannot reverse it back into a PAN, which is the property that makes it usable in contexts (analytics, loyalty programs, some dispute workflows) where the actual PAN would be too sensitive to circulate. See EMV 4.4 Book 3.