What happens when you tap a card?
The beep is not a payment. It is a promise, and the money turns up days later.
Clocks grow. Time expands. The single coin sits at settlement, that is the only moment the money exists.
Event one: authorization, the promise
You tap. A question sprints around the world: will this card pay this amount? It travels from the terminal to the shop's bank, to the card network, to your bank, which checks your balance and your fraud signals and answers yes or no. That answer races back and becomes the beep.
Roughly seven parties touched your coffee before you did. And what came back was not money. It was a promise to pay.
Event two: clearing, the paperwork
That night, the shop's systems bundle up the day's approved promises and submit them in batches. The networks then sort out who owes what to whom across millions of transactions, cancelling most of them out against each other so that only the differences need to move.
This is accounting, not money. It happens while everyone sleeps.
Event three: settlement, the money
Only now do balances actually shift between banks, typically a day or more after your tap. The shop receives its money, minus fees. On a Saturday sale with a Monday bank holiday, that gap can stretch to four days.
Which produces a fact almost nobody says out loud: between your tap and settlement day, the merchant handed you real goods and holds only a promise. For those days, the shop is extending you credit.
It is the difference between a friend saying "I will pay you back on Friday" and the money appearing in your account on Friday. Both are real. They are not the same event, and only one of them is money.
Why this explains the weird stuff
Once you can see the three clocks, the puzzling everyday things resolve. A cancelled hotel hold takes days to disappear because the promise has to be released, and releases travel on the slow clock. A payment shows as "pending" because it is a promise sitting between clock one and clock three. Refunds take days because they are a new instruction riding the same slow rails.
Where you meet it
Every card payment you make. And if you sell anything, in the gap between your sales report and your bank balance: the sale, the batch, and the deposit are three different things on three different days.