You don't even need a loyalty card. Match up the amount and time of the charge t... | Hacker News

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		nobodysfool on July 4, 2014 \| parent \| context \| favorite \| on: Hospitals Are Mining Patients' Credit Card Data to... You don't even need a loyalty card. Match up the amount and time of the charge to the in-store inventory system, and you can be about 99% sure that you are correctly matching the person's card to their purchase. If the store scans a UPC, then that UPC is in their system. Sure, the receipt may just print 'candy bar' but the UPC says 'Butterfinger 2oz classic bar'.

judk on July 4, 2014 | [–]

The receipt already contains the payment number and the purchase content UPCs. No need for uncertainty at all.

semerda on July 4, 2014 | [–]

The UPC is a simple linear barcode storing only digits which references to the product in the inventory system.

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