I always pay at the pump, with a credit card.
Anyway, did you ask the gas station cashier what their policy is for keeping their pump handles and such clean and disinfected? Because I don’t see anyone out there spraying and wiping the pumps every half hour, or after every customer.
I did go to a station that had a hand-sanitizer set up on the island where the pumps are, so there is that.
When someone asks me to wear a mask when they are wearing one tells me they are not “confident” that their mask works.