The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
http://www.casey.vic.gov.au/files/610b6fc7-aa32-4d83-9d7d-a4d700900c28/Position-Description-Coordinator-Wilson-Botanic-Park-Vacant-02-07-2015.pdf