There's renewed calls for an outright ban on card payment surcharges. 

Consumer NZ says the Commerce Commission's considering lowering interchange fees, but there's no guarantee it'll reduce what consumers pay.

It says a proper ban would be more consistent and fairer for buyers and merchants.

Research Acting Head Jessica Walker says there's been adjustments to interchange fees in the past - and there's doubt this latest change will be different.

"What we're calling for is for the Commerce Commission to make this a priority - and at least consider putting surcharge bans on the table."

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