How do I know that my app is used as a password provider app in Settings?

I'm looking for some way to get any "status" from this screen into my app

What I'm trying to do? After selecting my app as a "password provider" I want to open the app as an extension, with some "welcome" screen. I know that's possible because I see the same behavior in another application. Could anyone tell me where I can find the necessary info and what API/SDK I need for this? Thanks for your help!