Every thing I built needed a login and a way to charge for it, and that was always the slow part and never the point. Cladior is the version where you skip it.
The proxy either bills correctly or it fails closed. There is no third option worth shipping.
Most of the work is making the boring path fast. Nobody notices an edge that answers in fifty milliseconds, which is the goal.
A consent screen is the one moment a stranger decides whether to trust you. It gets the same care as the product behind it.
I read every integration that goes wrong. The docs are written from those, not from the API surface.
Money leaving the system is the part you cannot undo, so it moves slowly and says exactly what it did.