Tips I learned about money when traveling in New Zealand:
New Zealand is card friendly. You can use your card to pay in almost every place except at the farmers market and at roadside stalls. Paywave in New Zealand though is only available at supermarkets and upscale restaurants.
If you need cash the best option is to withdraw at ATMs. Most banks have a withdrawal limit of NZ$2000 per day( This also depends on your home bank ATM withdrawal limit). You won't experience any challenge using ATMs in New Zealand if you have a 4 digit pin.
If you had carried cash to New Zealand, the best place to buy New Zealand dollars is at money exchange kiosks. They offer better rates compared to banks and most banks in New Zealand also limit the amount of money you can exchange if you are not their customer. You'll find money exchange kiosks almost everywhere throughout downtown Wellington, Christchurch, and Auckland.
Most New Zealand banks are only open during weekdays from 9.30 am to 4.30 pm. Kiwi bank and ASB are open also during weekends
There's no limit to the amount of cash you can import or export from New Zealand. If you have more than NZ$ 10,000 or an equivalent of that amount in a different currency, you have to fill out a border cash report. NZ customs are pretty serious about this rule. Failure to fill out a border cash report can lead to being fined, imprisonment, or your cash being taken away from you.