How to create a facebook webhook and integrate it with laravel?

I am building a CRM app in laravel for which I am carrying out Facebook integration. I have achieved the following already

• Authentication
• Access token has been generated
• pages list is available
• the leads are being fetched but the lead_id is hardcoded and I wish to convert them into dynamic code. also, my access token is being saved in cookies, so should I save it in my database or use cookies only?