Retailers enjoyed only a modest improvement in spending patterns over December, according to Paymark.
The company, which processes about 75 per cent of all New Zealand's electronic card transactions, said spending in December was up for the third month in a row.
The seasonally adjusted total spend through the Paymark network increased 0.5 per cent from November to December 2012, which was also the third consecutive monthly gain.
Despite the positive spending in the week leading up to Christmas, the December month in total increased by a below average 2.3 per cent year-on-year, the company said.
After adjustments for seasonal fluctuations, the growth rate was a more positive 4.3 per cent.