The privateinternetaccess.com article has a link to https://worksafe.govt.nz/managing-health-and-safety/novel-coronavirus-covid/covid-19-alert-level-2-public-health-requirements-what-you-need-to-know/ I took a look around, and found this:  For contact tracing you are required to:   keep contact tracing records or register for all workers and those who carry out work for the business or service.   Note contact tracing records for customers are not required.