The app ID is com.google.android.verifier, which I assume will be used for the upcoming developer verification program for installing 3rd party apps.

Starting September 30, developers (signing authors) need to be verified from Google to distribute apps in the following app stores:

• Google Play Store
• Honor App Market
• OPPO App Market
• Samsung Galaxy Store
• Transsion Palm Store
• vivo V-Appstore and
• Xiaomi GetApps

only in the countries of Brazil, Indonesia, Singapore and Thailand.

F-Droid is not included for this time.

It is planned to be rolled out globally across all markets/app stores by January of 2027.

Relevant sources:
https://developer.android.com/developer-verification/guides
https://keepandroidopen.org/

I used App Manager (io.github.muntashirakon.AppManager) for the screenshot; you can use your regular 'Installed Apps'/'Apps' menu to see if it's been rolled out automatically for you as well.

edit: First link was originally a typo, my bad. Fixed it.