As far as I can see the COVID-19 Public Health Response (Protection Framework) Order 2021 has been updated to reflect that displaying QR codes is not required and you don't have to have alternative methods for contract tracing. The body of the legislation is the framework but you have to go to the schedules 5, 6 and 7 (Green, Orange and Red) to see what applies in each of the traffic light settings. The clauses about QR codes have now been removed from all the relevant schedules.

Hi Gordon,
At NMIT we use NZ based Assura software (based in Christchurch).