People on social media are complaining their EFTPOS transactions aren't going through tonight.
A spokesperson for Paymark said it was investigating to determine if there was a problem.
He said support staff were trying to find out whether the fault was in its own systems or further afield, such as at supermarkets, banks or in the communication lines.
Full trolley and pak n save announces that eftpos is down....— Harriet Riley (@HarrietRileyNZ) February 1, 2016
Eftpos busted!— Mark Goldfinch (@mark_goldfinch) February 1, 2016
Dairy full of confused people because eftpos is down, all scratching their heads at the term "cash"— Angus W (@evilkud) February 1, 2016