Mastercard is the world's most used payment method and if you look down in your wallet, there is a great chance that there is a mastercard card issued by some New Zealand bank and chatter.
It is therefore quite natural to check whether you can use your debit/credit card to deposit money at New Zealand casinos. The answer, as you already understood, is yes.
Almost all casinos offer deposits and withdrawals by credit card/mastercard, despite the fact that the payment method is now quite outdated when it comes to internet payments.
Many people use their credit card to earn bonus points from the credit card issuer/bank, which also works when depositing money at a casino.