How video call work on linked in using ZOOM collaboration in mobile

Anyone has any idea how video call work on linked in? Especially I wanted to know zoom meeting creation. I have an idea about creating a meeting and all using API's. I wanted to know the following,

1. Are they using OAuth API's or native SDK's for mobile?
2. How they are getting zoom login page and how they are getting the user details like Token and user details etc.?

I wanted to try to integrate in mobile. As flutter doesn't have stable SDK. So trying different solutions.