I remember when they started to get chip and pin readers on gas/petrol pumps in the USA. 'As an added security please enter your zip code'. I took great delight in going to the cash desk to say their readers wouldn't take my postcode.
'It's easy just enter your zip code' (the card readers being all number). 'My zip code is HP11 1DP - how do I enter that on the keypad?' I doubt many readers of this column will be surprised to know just how many Americans don't realise there are places outside America who may actually do things differently. (Their last 3 presidents didn't, so why should the average Joe?)
The solution in general was to send the Head of Household to the cash desk waving a fistful of dollars so they would authorise pumping, and then pay by card at the desk after pumping, which didn't present a problem.