I'll be in Scotland for a week in April with a rental car. How would I go about paying for fuel with a US credit Card?

It has a Chip. But no PIN. Banks think we are too dim and will forget these. (never mind we have them for debit cards, another day)
Will this work at the pump still or should I go in?
Just pay cash?

If go in/pay cash, do I need to pay first?

Thanks all!