Access AWS Amplify Console

1. Go to the AWS Management Console
2. Navigate to "AWS Amplify"
3. Select your application

Add Custom Domain

1. Click on the "Domain management" tab
2. Click "Add domain"
3. Enter your root domain (e.g., yourdomain.com)
4. Click "Configure domain"

Choose Subdomains

1. Configure the subdomains you want to use:

   • Root domain: yourdomain.com (typically mapped to www)
   • Subdomain: www.yourdomain.com (typically mapped to main branch)

2. Click "Save"

Verify Domain Ownership

For domains not on Route 53:

1. Amplify will generate DNS records that you need to add to your domain registrar
2. Add these records through your domain registrar's DNS management console
3. Wait for DNS verification (can take up to 48 hours, but often completes within an hour)

For domains on Route 53:

1. Amplify can automatically add the required DNS records
2. Simply approve the changes when prompted

Verify SSL Certificate

AWS Amplify automatically provisions an SSL certificate for your domain through AWS Certificate Manager (ACM).

1. On the Domain management page, wait for the SSL certificate status to change to "Available"
2. This process may take up to 24 hours, but often completes within an hour

Update Google OAuth Configuration

1. Go to the Google Cloud Console
2. Navigate to "APIs & Services" > "Credentials"
3. Click on your OAuth 2.0 Client ID
4. Add your custom domain to Authorized JavaScript origins:
   • https://yourdomain.com
   • https://www.yourdomain.com
5. Click "Save"

Update Cognito App Client

1. Go to the AWS Cognito console
2. Select your user pool
3. Go to "App integration" > "App clients and analytics"
4. Select your app client
5. Add your custom domain URLs to:
   • "Allowed callback URLs"
   • "Allowed sign-out URLs"
6. Click "Save changes"

Update Stripe Webhooks (If Necessary)

If you've set up a custom domain for your API Gateway:

1. Log in to the Stripe Dashboard
2. Go to "Developers" > "Webhooks"
3. Click on your webhook endpoint
4. Update the webhook URL to your custom domain
5. Click "Update endpoint"

Access Your Site via Custom Domain

1. Open a browser and navigate to your custom domain
2. Verify that your application loads correctly
3. Check that the SSL certificate is valid (look for the lock icon in your browser)

Test Authentication

1. Sign out if you're already logged in
2. Test both email and Google sign-in to ensure they work with your custom domain

Test Stripe Integration

Make a test subscription purchase to verify that redirects to and from Stripe work correctly with your custom domain.