Is there any API for dropbox business Account to get a list of all users and their activity ?
Yes, you can use the Dropbox Business API /2/team/members/list[/continue] endpoints to list the members of the team, and the /2/team_log/get_events[/continue] endpoints to query the activity on the team.
Those are links to the documentation for the HTTPS endpoints themselves, but we recommend using one of the official SDKs if possible. Those have corresponding native methods for the HTTPS endpoints.
