Looks like the Solterra (and bZ4X) will be able to use EVgo's Autocharge+, which uses the Plug and Charge standard to charge a car and bill the owner automatically without the use of the app or a credit card to start the charging session.
electrek.co

EVgo expands Plug and Charge capabilities to EVs beyond GMs Ultium Charge 360 network including Ford, Polestar
US public charging network EVgo has announced an expansion of its Plug and Charge capabilities via its new Autocharge+ technology....