It's my understanding that until the NIR solution (that's out new immunisation register than they needed to build for Covid) is further progressed that we have no way yet of doing centralised digital vaccine records. We're not like Australia who has a centralised app for health records - here people just have the likes of manage my health for their local GP.
When I was a working DHB Paediatric Nurse and was first signed off to give, then register paediatric immunisations in 2014, I was appalled at the software being used. The UI was terrible. Over complicated with too many tiny boxes. It certainly came across as being designed by bureaucratic committee and not the coalface users.
I only hope this NIR solution is not based upon that system.