EFTPOS and debit cards access the money in your bank account. You can use the card at bank machines to withdraw cash, and at retailers to buy items using your own money.
Most retailers in New Zealand have EFTPOS terminals, but many businesses offering services may ask for other types of payment, like cash or direct credit payments into their bank accounts.
When paying with cash, the total cost will be rounded up or down to the nearest 10c. When paying by card, you pay the exact amount.