Tap & Pay (Apple Pay, etc) are a great backup option -- and Starlight will implement those, but the primary modality of payment should require no user input. That's what we are hoping to accomplish. It's especially important when you are plugging in every night. Fiddling with your wallet or phone (battery dead??) is just one extra step that ultimately is not necessary if we are to design a system at scale.
This is a smaller use case—folks living in apartments without direct electricity connection. While the case exists and can be improved separately it shouldn't dictate requirements/costs to the rest of us.
Think I'd try to solve that by having the customer register the car/payment once at the kiosk and then handle plug-and-charge-and-bill though your service. Then you don't need to wait for an external solution and can advertise convenience as your added value in the meantime.