1. Open Firebase Console

Navigate to the Firebase Console and sign in with your Google account.

2. Add New Project

Click Add project (or Create a project).

• Enter a project name (e.g., go-shortener-auth).
• Google Analytics is optional; you can disable it if not needed.
• Click Create project and wait for provisioning to complete.

1. Add Web App

On your Firebase Project Overview dashboard, click the Web icon (</>) to register a new web application.

2. App Nickname

Enter an app nickname (e.g., GO Web Client). Leave Firebase Hosting unchecked unless you plan to use it. Click Register app.

3. Obtain Client Configuration

Firebase will display a firebaseConfig snippet containing your keys:

const firebaseConfig = {
  apiKey: "AIzaSy...",
  authDomain: "go-shortener-auth.firebaseapp.com",
  projectId: "go-shortener-auth",
  storageBucket: "go-shortener-auth.firebasestorage.app",
  messagingSenderId: "123456789012",
  appId: "1:123456789012:web:abcdef123456"
};

Keep this window open or copy the values into a temporary scratchpad.

1. Access Authentication

In the left sidebar of the Firebase Console, navigate to Build > Authentication, then click Get started.

2. Enable Google Sign-In

In the Sign-in method tab:

1. Click Google under the list of additional providers.
2. Toggle the switch to Enable.
3. Select your support email address from the dropdown.
4. Click Save.

1. Open Authorized Domains

In the Authentication section, click the Settings tab and select Authorized domains.

2. Add Your Production Domains

By default, localhost is authorized. Click Add domain and enter your production hostname:

• go.arcn.online
• (Optional) Any custom staging or reverse proxy domains.