The content such as the workspace's billing plan, "users on your plan", "MB/GB of file storage used", "build minutes used this billing period", and "Bill Estimate" are all only available by viewing the web UI at https://bitbucket.org/{workspace}/workspace/settings/plans-and-billing however, it would be nice to be able to pull this information from the API so as to allow customers to quickly view these metrics in an upstream dashboard.