They generally pre-auth for either £20 or £40 and then update the amount post-transaction.
In terms of PIN check, the card is just declined with an appropriate error message because you can’t insert it and the next time you use a contactless machine it asks for the card to be inserted and a PIN entered.
For petrol (gas) pumps in the UK it generally auths either £1 or £99.
In terms of PIN check, the card is just declined with an appropriate error message because you can’t insert it and the next time you use a contactless machine it asks for the card to be inserted and a PIN entered.
For petrol (gas) pumps in the UK it generally auths either £1 or £99.