Bulk Create Work Order

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. Creates multiple orders in one call. Each item in purchase_orders uses the exact same field shape as the single Create endpoint's purchase_order object (see Create Purchase Order / Create Work Order), just without the outer wrapper key.