Spending using electronic cards fell a seasonally adjusted 0.2% to $3.2 billion in February - excluding car and fuel sales.
It was the second consecutive monthly decline, Statistics New Zealand says.
Total transactions fell 0.3% to $4.9 billion.
Spending has increased by just 0.1% percent over the last four months.
ASB chief economist Nick Tuffley says spending on consumables, which often refers to food, was relatively strong, but there was weakness in outlay on big ticket items.
He says consumer spending remains fairly subdued.