Where I live (Germany) they usually have cards with which they can pay at most big gas stations. Kind of like a pin protected voucher card. They usually have a maximum limit though.

So when we operate a mobile gas station in catastrophic events like big wildfires etc. We usually have to get a limitless card, because otherwise we need a new card 3-4 times a day because we refill our 450 liter tank so often.

Most fire stations and probably police stations too have an emergency depot though. As does the city. Sometimes the city depot is shared with the depot of the public transport company though.