Ford has already announced they will support plug and charge on Tesla chargers also

The whole paying on a terminal/using an app thing is the wrong approach I think. Ultimately to charge there is a handshake protocol between two computers, just sort out payment then (and thats the standard NAC supports https://en.wikipedia.org/wiki/ISO_15118)

Adding a payment terminal is just adding another handshake and computer into the mix, a computer that needs to be (mostly) connected to the internet, exposed to the elements, and vulnerable to skimming devices.