Setting up Google Authentication

Create a Firebase project here: https://firebase.google.com/. You'll need a signed Android build for that, that can be a debug auto-signed build too, just retrieve the signing hash.
Place the generated google-services.json file in android/app for Android and the GoogleService-Info.plist into ios/app/src for iOS (you can stop at that step, no need for the driver and the code changes they suggest in the wizard).
You may want to exclude these files in YOUR GIT config (do not exclude them in the .gitignore of the application itself!).
Your WEB and iOS client IDs are auto generated during the Firebase project creation. Find them in the Google Developer console: https://console.developers.google.com/
Make sure your config reflects these IDs so then the Redux state of the feature features/base/config contains variables googleApiApplicationClientID and googleApiIOSClientID with the respective values.
Add your iOS client ID as an application URL schema into ios/app/src/Info.plist (replacing placeholder).
Enable YouTube API access on the developer console (see above) for live streaming.