Electronic card processor Paymark says weaker spending in April is due to public holidays during the month.
Paymark processes about 75% of all electronic transactions in New Zealand.
It processed $3.7 billion last month, down 0.3% compared to the same month in 2011.
Paymark says electronic spending is typically slow on holidays such as Easter and Anzac Day which fell in April.
It says Auckland, Northland, and Palmerston North spent more in the month than last year, while everywhere else fell.