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One place I worked at while in college had a similar thing with smart cards. The vending of the product and debiting of the card wasn't an atomic operation, so
by lucaspiller 11y ago
One place I worked at while in college had a similar thing with smart cards. The vending of the product and debiting of the card wasn't an atomic operation, so if you removed the card at the right time you'd still get the product but not be charged.
- throw91283 11y agoThey must have changed that. At a cafeteria that uses MIFARE cards the operation is still not atomic, but the customer loses: If you remove the card at the wrong time, the card is debited but the transaction does not show up on the cashier's terminal, leading to heated arguments. The transaction does show up in the central database, so after spending 20 min writing a complaint you get your money back after a few days. I guess this is called progress.