Yeah you'll end up reading the source code regardless if it's simple or not though haha. I've had to read through tons of the Identity and Auth code to get a handle on how to integrate with it and there are TONS of interfaces, implementations, and etc you have to cross-reference and hunt down to start building a mental model. You don't even get a diagram in the docs explaining how all the different filters and crap tie together(on top of auth having ITS OWN MIDDLEWARE PIPELINE) lol.

Combine that with maybe the info you are looking for actually is in the docs, but it's sprinkled across loads of examples so it's hard to find or build a comprehensive understanding of.