Too many "players think they can get in the middle and earn a rent" from contactless payments, Kelly Bayer Rosmarin, executive general manager at Commonwealth Bank, told the FST Media banking technology conference in Melbourne on Friday.Responding to a question on "where telcos fit" in the payments landscape, Rosmarin said: "Australia is a leading place in the world for NFC acceptance.""NFC has legs. It's a very convenient platform."Demand in Australia for contactless payments continues to strengthen - with the main action remaining around NFC installed on plastic debit and credit cards, rather than NFC-enabled smartphones.Industry estimates suggest that there are somewhere between 100,000 and 200,000 contactless-capable terminals deployed nationally."The challenge is to make mobile phones [work in contactless]," Rosmarin said. "A lot of players think they can get in the middle and earn a rent from that."So while they argue about that, applications come up with other technologies [such as our] Kaching cases. It's a solution that allows our customers to do want they want to do."There's not that much money to extract as rent from those transactions. There is a very small margin anyway."