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> What stops the waiter or waitress using all the info on Amazon? Most people don’t want to go to jail after their fraudulent purchase is quickly flagged

• asciident 6y ago
  It's hard to track down. They could just write down your credit card number, name, expiration, and security code. Then use it a month later, at which point you have already been to several restaurants and handed people your card many times. And you don't know if the card was taken in some other way like a online retail hack.
  • nemo44x 6y ago
    It’s not too difficult for the credit card companies to pin this down. Basic graph algorithms on their datasets of transactions detect this pretty quickly. And these are running constantly trying to detect fraud ASAP. Problematic businesses can lose their credit card privileges too.
    • zbentley 6y ago
      Those algorithms can be very good at detecting fraudulent transactions. However, I'm unfamiliar with systems designed to isolate the origin of the fraud. It's not hard trace a stolen card number to a dump of cards sold on the dark web, or the identity of a person using it after the theft, but it is quite hard to figure out how that person came into possession of the card. My subjective impression is that first-party theft + usage of stolen payment credentials is rare--they're usually passed along (sold) to someone else.
      • nemo44x 6y ago
        In a single isolated incident then yes, it is difficult. However many thrives get greedy and don’t realize it’s fairly easy to identify the point of sale where fraudulent activity originated.