I totally get with the prepaid oyster that when it’s topped up I’m physically touching it to the contact so the data is transferred, but with a debit card (especially if I’ve say paid for something online) how does it know what’s on the card ?)
In: Technology
Basically, only familiar with this from the week I spent in London for my birthday. When I tapped in every morning, it would “reserve” some money in my account and then let me through. Much like a deposit. At the end of the day, sometime past midnight, the price would get adjusted and the payment executed. At least that’s what my banks reported on all three of my cards
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