Direct-to-car billing would be even less acceptable. Chargers should let you use a credit card without having to involve an account anywhere, be it on a phone app or on the car.
I know I'm more -- ahem -- cautious than most, but I'd be very nervous about entering any sensitive data like that into a car's data system. I'm not even comfortable connecting my phone to a car via bluetooth.
It wouldn't necessarily be a showstopper for me, but I would certainly want to see others use such a system for a few years before I started to, to be reasonably confident that the car wasn't helpfully storing my payment details for me or passing them along to an entity not involved with the transaction.
Just let me pay for my fuel at the point of purchase with whatever card I choose. I may have a corporate card that it is appropriate to pay with vs my personal card. Pay at the pump has been a solved problem for the entirety of the 21st century. There is no reason to "fix" it.
Could you not buy a drink or snack at these stations either?
We have activated heated seats of your car for 9.99EUR/month. Oh did you missed that notification and noticed it after a year from your bank history? Well sucks to be you.