Think of the No Jab No Pay/Play policy and now add to it.

Its never mandatory.

No Jab - No Job
- No Travel
- No [INSERT COMMERCIAL SERVICE]
eg: Shopping, Sporting Activities

Essentially NO JAB = NO LIFE

"While the Australian Government strongly
supports immunisation and will run a strong
campaign to encourage vaccination, it is not
mandatory and individuals may choose not to
vaccinate. There may however, be circumstances
where the Australian Government and other
governments may introduce border entry or
re-entry requirements that are conditional on proof
of vaccination."

Monitored by all things .... AIR

"The AIR will be the unifying national system to
monitor both overall immunisation levels and
individual immunisation status. It will be mandatory
for vaccination providers to make timely
recordings of any COVID-19 vaccinations into AIR"

So there is a national register.