as long as the bank card is marked with Unionpay, you can withdraw NZD cash from ATMs in BNZ (Bank of New Zealand), ANZ (ANZ Bank), KIWIBANK and NZCU all over New Zealand, and you can also spend it by tens of thousands of merchants with UnionPay card swiping equipment.
If you have a dual-currency credit card issued by the Bank of Chinese mainland, and the card has the logo of Visa or Mastercard, then basically all businesses in New Zealand can directly spend their credit cards, including large supermarkets, coffee shops, grocery stores, convenience stores, etc., as long as there is credit card equipment, the amount of New Zealand dollars spent will be converted into US dollars and recorded in your card, and finally the repayment can be made in US dollars or RMB.