Any logout API ?

[Gsri_Inno]

App type: Meeting SDK {Android v5.14.11.14322}

Currently, we are integrating Zoom SDK into the app using ZAK. We are following this link https://developers.zoom.us/docs/meeting-sdk/android/build-an-app/pkce/ documentation for meeting creation.  Here we have two queries, could please check and confirm how to achieve these? 

1.  Currently, the user navigates to the browser for login and is able to get the access token from it. But we are not able to log out of the user from the browser. Is there any API for user logout?
2. Another query like, we are able to initiate the Zoom call, and able to see the chat option in the call. But we are not able to send the media over the chat. How can we enable that?