[1] Sign In Using ID Tokens | Smart Lock for Passwords on Android | Google Developers
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https://developers.google.com/identity/smartlock-passwords/android/idtoken-auth
The aud claim of an ID token from Smart Lock for Passwords has the following format:
android://SHA512_HASH@ANDROID_PACKAGE_NAME
The value SHA512_HASH is the SHA-512 hash of your signing certificate.