Hi Nev29
Thanks for your post. I had look on the Westpac NZ website and they give the following alternatives to the zip zap machines:
If you need to process transactions, there are several options available - for example, card present and card not present sales via a terminal or ecommerce solution. There are also non-card solutions like online bank account transfers. For business continuity planning, you can use electronic offline vouchers (EOV) via your terminal.
Read more here: Decommission of Westpac card imprinters (zip zaps).
If you would like to have more information about accepting NZ credit card payments I would recommend contacting Westpac.