Thousands of retailers may be unaware their Eftpos machines will stop working at the end of April if they don't upgrade them, a survey suggests.
Research by Eftpos provider Smart pay has found 49 per cent of retailers were not aware of the switchover and 57 per cent didn't know they needed to upgrade their software or terminal to accommodate the change.
The switchover will mean older versions of Eftpos software - Eftpos 6.1 and PTS 2013 software - are no longer supported on the New Zealand network from April 30.
All new terminals will allow contactless payment allowing people to use Applepay and Androidpay.
Its survey covered around 400 retailers but Smartpay estimates between 20,000 and 40,000 retailers nationwide will be affected by the upgrade.