Make a policy for the organization, a workspace, a project or a key. One per scope; the narrowest wins.

Organization admins only (403 organization_admin_required), on a browser session with a fresh proof in the x-50h-reauth header (401 reauth_required). It needs a person: API keys, connected apps and service accounts get 403 session_required. Every change is written to the organization's audit. Approvers must be people in the organization (in the workspace, for a workspace, project or key policy).