Getting a full list of users across all products under a site with REST API

[Andrey Popov]

Hello folks,

I'm wondering if there's a way to fetch all user accounts (managed and external) for a specific site via the REST API with at least their Atlassian userIDs and email addresses?

Atlassian Access provides a convenient way of doing this through the exporter and even lets me select what information I want to see, however, we have about a dozen sites within our org and ideally, we'd like to automate this process.

I realize that I can get a complete list of user accounts managed by our 1 central org with single export within Atlassian Access, however, this type of export excludes users that are not managed by our org. I need all accounts and not just the managed ones and as far as I know, there isn't a good way to do this. 

Is there something I'm missing here?

Thank you,

Andrey