This is correct. Rivians are hardware capable of bidirectional charging, they’ll need a software update to implement it.

Does this happen to be a Chargepoint charger? Their power modules are 30kW, so that unit could be down to one functional power module.

Recently saw a charger whose fee structure was per kWh, but had a minimum per minute that would be billed. So people whose charge rate had dropped below some point were being charged more.

You’ll pay for each charge at the time of charging, unless you get a Tesla than it’ll be billed to you at the end.