1. Set up a Firebase project. 2. Enable the Google sign-in provider. 3. Set up Firestore security rules. Check out firestore.rules.example in the repository. 4. Add a web app to the project and note its config. 5. (Optional) Set up App Check from the Firebase console. You don't need to do step 3. The widget initializes App Check if you supply the reCAPTCHA site key. 6. Add the following code in your page: