Renames a saved order template, changes its description, or marks it active or inactive in Zuper. Only Zuper's copy changes: the template at the supplier, its product list and any products already imported stay as they are. Send just the fields you want to change inside order_template; other fields are ignored. The supplier provider must be CONNECTED; otherwise the request fails with 403. Admin only: the API key must belong to an admin user; other roles receive 405 Access Denied.