Those methods are created dynamically and not documented. See second spoiler of https://forum.gurtam.com/viewtopic.php? … 13#p161813
You need to get resource object with zones loaded (via updateDataFlags or searchItem(s)), get needed geofence object by getZone (or getZonesData([id], callback), if you need some additional data like points), modify it and call updateZone(zoneData, callback).
For such methods you can read Remote API docs — resource/get_zone_data, resource/update_zone.
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