Hi,
I'm also concerned about the requirements.
I haven't found any functionality in Firebase, but let me share what I've found so far.
From the news:
> My app uses Sign in with Apple to provide account creation and authentication to users. What changes are necessary to support users who delete their accounts?
> Apps that support Sign in with Apple should use the Sign in with Apple REST API to revoke user tokens. To learn more,
review the documentation
The documentation says we need to send a post request to
to revoke user tokens.
For experimenting, I opened Firebase Auth's user list in the console, and I deleted my test account which uses Sign in with Apple.
Then I checked the iOS Settings app, but my app's authentication with apple was not revoked.
This page explains where to find the settings inside the Settings app.
I hope we can find an easy way to implement the guideline.
Kenji