Hackers have attacked Auckland Transport's HOP system, knocking out a number of services for at least a week.
Online top-ups and transactions using Eftpos and credit cards are out while some ticket and top-up machines are also unavailable.
AT chief executive Dean Kimpton confirmed it was a ransomware attack, called Medusa, and no personal or financial data was believed to have been compromised.
Gorilla Technology chief executive Paul Spain spoke to Ingrid Hipkiss.
