Getting Started with Auth

I tried to build an Ionic Angular app a few years ago and got pretty far with it.
Since then a lot has changed, although I still have a lot of my old code that I would like to re-use.
I managed to get a new scaffold tabs project running without any issues.

I would like to start fresh with a simple login page Okta integration. Is there any direct documentation on how to do this?

I saw this: Okta Configuration - Auth Connect , but it keeps leading me to something paid?