I built a service that lets you bolt an oauth/oidc provider onto your app with a single callback. https://github.com/poundifdef/connectivly

It lets you use whatever you’re already doing for auth, and lets you become an oauth provider, or issue tokens instead of people passing API keys, on top of that.

The more interesting aspect of that you could use it to bolt on an entire app store or ecosystem on top of your existing product or api.

(ping me if you want to look at this more seriously from a business perspective!)