Unify chat web app

I'm making a web based application that can unify chat from facebook messaging and facebook post, comment

Tech Stack
front end : vue.js,vuetify
backend : .net core or node.js
database : firebase


Feature
-users can login with their facebook account
-users can select facebook pages they want to unify chat
(can select more than 1 page)
-Users can anwser to their customer via chat ui
text,picture,file
-Chat UI must show which message coming from which page
-filter unread message
-tag customer
-search by tag
-search by customer's facebook name
-filter by page