Remove it at any time, no. The chip on the card is cryptographically signing the transaction, which includes the total. It can't sign it until the total is known.
In practice, I suspect the equipment is designed not to allow you to insert the card early so that you check the total first.
Remove it at any time, no. The chip on the card is cryptographically signing the transaction, which includes the total. It can't sign it until the total is known.
In practice, I suspect the equipment is designed not to allow you to insert the card early so that you check the total first.