Setup Firebase for your own Vercel instance

1. Create a Firebase project: https://console.firebase.google.com/

2. Setup a Realtime Database and make note of the database URL (it's something like https://project-name.firebaseio.com/)

3. Set the database rules to something like:

4. Navigate to the Service Accounts tab in the Firebase project settings and click Generate private key. This will download a JSON file. In the JSON file you'll find the project ID, private key, and client email.

5. Base64 encode the private key (it's ok to keep all the newlines):

   $ echo "-----BEGIN PRIVATE KEY-----(...)-----END PRIVATE KEY-----\n" | base64

   In Vercel, set that as the value of the secret environment variable FIREBASE_PRIVATE_KEY_B64.

6. Set the secret environment variable FIREBASE_PROJECT_ID to your project ID.

7. Set the secret environment variable FIREBASE_DATABASE_URL to the Firebase database URL (from step 2)

8. Set the secret environment variable FIREBASE_CLIENT_EMAIL to the client email.

9. Redeploy your Vercel app.