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IIRC tapping credit cards on London’s underground turnstiles use offline chip authorization to avoid delays.
by rescbr 1y ago
IIRC tapping credit cards on London’s underground turnstiles use offline chip authorization to avoid delays.
- lxgr 1y agoIt uses offline authentication (i.e. checking whether the card is authentic), but not authorization (i.e. whether it’s funded, not stolen etc.) Unfortunately, too many cards, and all mobile wallets, don’t support offline authorization for that to be viable.