Get WhatsApp Business Management Permission

Ensure your Meta app (ID: 682893101304804) is set up with:

• App type: Business
• Permissions: whatsapp_business_management
• Valid OAuth redirect URIs: https://yourdomain.com/auth (replace with your actual domain)

Update the script: Replace 'https://yourdomain.com/auth' with your redirect URI, then host this page there.