Paymark says spending growth in major centres such as Auckland and Wellington continued to come off the boil in December.
The Eftpos provider, which processes more than 75 per cent of the country's electronic card transactions, said aside from that cooling 2017 ended on a positive economic note.
About $5.9 billion was spent through Paymark's network in December, up 4.9 per cent on the same month in 2016.
Underlying spending was up 0.5 per cent on November, Paymark said.
"December was marked by strong growth early in the month, including 8.1 per cent annual underlying growth through Paymark in the first seven days, continuing on from the spending surge of late November. More moderate growth rates were recorded during the rest of the month, including 6.4 per cent annual growth on Boxing Day," Paymark said.