3 ms·
Have to wait to finish to insert the card and type the pin is just a matter of design of the equipment: you can insert it as any time of the supplier designs it
by woliveirajr 10y ago
Have to wait to finish to insert the card and type the pin is just a matter of design of the equipment: you can insert it as any time of the supplier designs it that way.
- Tibbes 10y agoInsert it any time, yes, possibly. 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.