This reminds me of the whole "pay at pump" thing they had a few years ago. best thing to ever happen to pumps if you ask me. Teh attendent had less work , shorter lines etc, it was great. Plus hwilw i was at uni and poor as i could empty my card into the tank as the pump would stop when your account hit 0.01.
They got rid of them becuse ppl would pay at pump and not impulse buy any more. Nice 1 BP, if only ure fuel wasnt so nice.