Comment by ChrisMarshallNY
12 hours ago
No, it's often quite possible to scan the watch while the transaction is still open (depends on the store; not all of them support that). The payment method is still open, and is closed by the cashier.
Yeah, it's "trusting" the store, but it has never resulted in unwanted charges. I do it for the person in line behind me. I can afford it, if there was to be an issue, and the service desk is about ten feet away.
In Japan, they make a ceremony of giving you your goods before accepting payment.
It's an edge case most hardware doesn't expose the ability to start charging you until the cashier totals it.
The only exception is that with some hardware/software is that within a narrow window it may be possible to go back and make a change after putting the pinpad in payment mode.
Remember the pinpad is a second computer not a peripheral.
I have never in decades of paying for things ever seen a checkout where you can tap right away.
I suspect that you may be in Europe.
The US has systems that make it easy to take the money away.
Giving it back...'nother story...