Hello, For the Aerogear iOS OAuth2 library, does it support cross-client authorization as documented here: https://developers.google.com/identity/protocols/CrossClientAuth? I have a project configured in the Google Developers console with two OAuth2 client IDs. I'd like to have my iOS app send a token request that contains both client IDs (one in the client_id field and another in the audience field) and receive a token that has the server_code field which I would then send to my web app to get it's own refresh/access tokens. Example requests below. Token request: audience <web app client ID>.apps.googleusercontent.com client_id <iOS app client ID>.apps.googleusercontent.com code 4/qmOAPMYafdJ1Qs14o6wK9Ok_p4bhkzjab72wwLtLg5A grant_type authorization_code redirect_uri com.googleusercontent.apps.<iOS app client ID>:/oauth2callback verifier 81803532 Token response: access_token String ya29.NgL_Yz4eECZQR0aHbrYh5_A06Rif_dQYxBLXXZLm5OQiInwKGcKI8Nd2PhxLNtV-XzoQ token_type String Bearer expires_in Integer 3600 refresh_token String 1/4aumZ1PQ00zk4xrc4W-xgjMIHA1GnDtpmc17Fopx9-RIgOrJDtdun6zK6XiATCKT server_code String 4/qz-ClSW_wudBxj5H7cCFhaNDYQQrtcytAokQje_XKf0 <---- NEW! id_token String eyJhbGciOiJSUzI1NiIsImtpZCI6... Best, Michael Doo