firebase authentication guide GOOGLE_GUID?

Trying to do the Google authentication for Firebase. The guide code says

clientId: '', 
redirectUri: makeRedirectUri({
// For usage in bare and standalone 
native: 'com.googleusercontent.apps.GOOGLE_GUID:/oauthredirect',

I know how to get the web client ID but where do I find the GOOGLE_GUID on Firebase or Google?

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