Update my app (add admin_panel...)

I want to make a admin_panel for my apps and add some new features to it. My app is a "conference app" to make ConferenceCall, it can make call in the 4 groups at the same time by admins, (admins can make call and other users just listen). we maked this app for ios/android with "xcode" and "android studio" and for make call we used of "Sinch SDK service", we used "google friebase" to make admin_panel and databases. *Add Admin_panel on website for make new groups like this: - add new admin_panel by web for make new groups 1-add customer: ex: Seven_Church + create databe for this customer 2- add groupname/groupCode Ex: group_name: English group_Id: En000111 3- addSinch_APIs Hostname: Key: Secret: 4- add Google_APIs. All Google_Apic that is needed for make database 5- create group admin_panel manage old groups like this: Add/block/remove admins Edit google APIs/sinch codes Edit group's name/groupID +++ *Add login system for login admins to website and make call from there like this: Username: GroupID: Phone number:...> verification by sms code and then login and manage self group *Add new ability to make Call from website *Add new ability to send chats/file/voice in the groups by self group's admins