Send 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. If email is provided, sends the order by email and returns a JSON success message. If email is omitted, the response is instead a raw PDF (or Excel, if send_excel is true) binary stream, not JSON.