The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/264137e4-5a90-4558-816c-a4d7008ff3b7/Position-Description-Coordinator-Wilson-Botanic-Park-Vacant-02-07-2015.docx