Retrieve a user by their ID. Users represent individuals who can access and manage resources within your organisation structure.

Related memberships are only returned when requested via the include query parameter:

• To fetch without related resources, omit the include parameter.
• To include memberships, pass include=memberships.

The include is unpaginated and capped at 1,000 accessible memberships: above the cap the request
is rejected with a 400 TOO_MANY_INCLUDED_MEMBERSHIPS. Use the List memberships endpoint
(GET /v1/memberships?filter[user_id]=USER_ID) to retrieve them page by page regardless of volume.

🔒 This endpoint requires an OAC (Organisation Access Credentials — ⚠️ Beta) access token with the users:read scope.