Add Facebook Settings to WhatsApp SaaS

I already have a working SaaS script for WhatsApp automation; the only missing piece is the Facebook-side configuration so users can connect their pages and operate seamlessly from the same dashboard. All core WhatsApp modules are running—what I need now is the code that pulls in the Facebook settings screen, stores the keys, and completes the hand-shake with Facebook so that future features such as Messenger inbox, page login, or even ads management can be enabled without touching the code again.

The script is well-structured (Laravel + Vue) and has clear extension points; you’ll receive the repo, environment file, and a short Loom video of the current flow. Your job is to:

• Add the Facebook settings module inside the existing “Integrations” menu, matching the current UI style.
• Guide me through the Facebook App creation steps so I can generate the required App ID, secret, and callback URL.
• Wire the credentials to the script’s .env and confirm that the SDK successfully exchanges tokens.
• Show a working test: connect a Facebook Page, send a test message, and verify it lands in the WhatsApp inbox for that user.

Please keep the code clean, commented, and commit in small chunks so I can review. If you’ve done similar SaaS integrations—with Facebook SDK, Graph API, or custom webhooks—let me know; that will speed up onboarding.