Which makes it interesting as to why some specific retailers are being advertised on the apple website as supporting applepay, yet actually just have standard contactless terminals.
Why are some retailers listed, and others not, when it is nothing to do with actually supporting (limitless) applepay?
Apple uses retail "Apple Pay partner" more for marketing than anything else.
It can simply mean the merchant has contactless terminals, updated or not for limits. Or it can mean they added Apple Pay as an option to their own iPhone merchant app. Or a combo.
It's often Apple Marketing's way of getting people to associate generic store updates with Apple Pay, and it seems to work.
If your using the London underground does it charge you every time you scan your iPhone or does it know you have already paid?
The system simply records your touch-in and touch-outs all day. At the end of the day, matching taps (or single ones for buses/trams) are used to calculate individual fares. Then all the fares for the day are totaled up and charged to your credit card.
If there are missing matches... such as might happen if you touched in with one card/device and touched out with a different card/device, or if you simply failed to touch out... they might wait a few days to see if their records need to catch up. After that, they assume you missed a touch and charge full price.
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