Originally Posted by
percysmith
I think with most POS at shops, charges will post unless something is done to stop it (i.e. a void).
With Harrods/GL-type POSes, everything will post. Errors will be handled by way of refund.
I think there might be a difference between US and UK on this one.
In US, the swiping does not generate sales, but authorization (this is based on my personal experience, so it is highly likely to be wrong). In the US, if I don't sign, a transaction cannot be completed, because the final and most important step of signing is not done, which doesn't give cardholder's permission to the transaction.
Likewise, in the UK, I wonder what would happen if someone insert their card, see the amount, but don't input their PIN (obviously they use Chip and PIN). Again, I think the transaction shouldn't be completed, because the cardholder does not provide the permission by not keying the PIN, right?