Edits an existing user account.

Only userId, firstName, lastName, username, and emailAddress are required. All other fields are optional for users that already have values set — omitted optional fields are left unchanged. For users with no existing value for a field (e.g. newly created users), include all fields explicitly. The safest approach is to use the full user object returned by /api/v1/usersynchronise as the base, with your changes applied.

To set the active flag or make more granular changes, use POST /api/v2/person/save instead.