You want the car to authenticate itself. Instead of installing dozens of different apps on your smartphone you want to just plug the charger into the car and then just confirm whether you agree to the fees or not. The owners of the charger just want to get paid so the payment can be done through a dedicated payment provider like Apple Pay, Visa, whose app you install. It's not any meaningfully different than a gas station. Nobody cares, you pay by cash, credit card or apple pay and get on with your life.