How can I get the total storage used by a member using the API?

Unfortunately, the Business API doesn't offer quite what you're looking for. You can get information about the connected team's overall space using using /2/team/reports/get_storage, but that isn't broken down by member or group:

https://www.dropbox.com/developers/documentation/http/teams#team-reports-get_storage

Likewise, /2/team/members/get_info and/2/team/members/list[/continue] don't return space usage information, as you mentioned. I'll send this along as a feature request though.

If your app has the "team member file access" permission though, one workaround is to use the member file access feature:

https://www.dropbox.com/developers/documentation/http/teams#teams-member-file-access

And call /2/users/get_space_usage for each user:

https://www.dropbox.com/developers/documentation/http/documentation#users-get_space_usage

The call per member could be a slow operation and potentially run into api throttling for mass reporting.

The admin center export of members has a column for member storage. Is there a programattic way of generating and downloaidng this export?

No, unfortunately that's not accessible via the API.

Is there a place or way we can track the feature request for this new functionality?

This forum thread serves as the reference for this feature request. I'll follow up here if/when there's any update on this.

Hi Greg, Any update on this feature request?

Getting space usage for each user by /users/get_space_usage is slow and eventually runs into rate limit or retry exception. 

SJ_Code No, unfortunately I don't have an update on this.