The PayTag stickers are activated via the revamped CommBank Android and iOS apps, from where customers can control the contactless functionality, turning it on and off as they need and selecting which account to pay from.

The app also works with NFC-enabled Android handsets, enabling users to skip the sticker and make contactless payments of up to $100.

Angus Sullivan, executive GM, cards, payments, analytics and retail strategy, CommBank, says: "As the only Australian bank with an NFC payment solution for both iPhone and Android devices, this will transform the way our customers make everyday payments."

The stickers are part of a broader overhaul of CommBank's mobile apps, which sees the standard account offering merged over the next few months with the Kaching payments app.

The app will enable peer-to-peer payments via Facebook and the phone's contacts and e-mail addresses. IPhone users can also make payments via Bump, tapping two handsets together.

Other features include the ability to check balances with a single swipe of the phone, to find the nearest ATMs and branches, and to pay bills via QR codes and the handset's camera.

CommBank says that three years ago, 88% of online banking logons were through a desktop but that today mobile is the main method, accounting for 56%. Meanwhile, the bank's volume of contactless payments have increased sixfold in the past 12 months.

Lisa Frazier, executive GM, digital channels, CommBank, says: "By leveraging the success of CommBank Kaching and using next generation mobile technology, the enhancements to the CommBank app will give customers access to world class mobile banking and payment solutions - effectively turning their smartphone into an e-wallet."