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Beneficial-Car-3959 t1_iwzkqcn wrote

Reply to comment by ice_cream_sandwiches in ELI5 How do card readers for online banking work if they are not connected to the internet? by Koopatrillion

He is probably in Country where you can go to two ATMs who are near each other. Takes money from one ATM than goes to other ATM. Second ATM shows original sum (like money never left first ATM).

ATMs are connected to Internet but in some countries sync with main database is slower (every 10/20 minutes).

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