Operates on Service Orders, shown in the Zuper client app as "Work Order" (in every industry). Work Orders share the exact same underlying schema and endpoints as Purchase Orders / Material Orders; they're distinguished only by the purchase_order_type field (SERVICE_ORDER here) and the /service_orders route prefix. Restores (undeletes) previously soft-deleted orders. Requires the caller's role to be exactly ADMIN — not just an equivalent permission key — or the request is rejected with 401.