Last month Google moved to breathe new life into its stuttering mobile wallet platform by launching a cloud-based version of the app that can be linked to any card.

Although card firms do not need to be explicitly onboard, Discover decided to back the service by adding a click-to-add feature to its online customer account centre to make it easy for people to load their card to the search giant's system.

Barclaycard US has now followed suit, adding its own click-to-add process, with LL Bean and US Airways co-branded cardholders encouraged to select it as their default Google Wallet payment choice.

Once signed up, users will see a full-colour image of their card as a Google Wallet payment option and be able to use it online where they see the 'Google Wallet Buy' button or in-person using the mobile app.

Google says that Green Dot and Silicon Valley Bank have also acted, as issuers, to provide it with art so that their cards can be added to the wallet, while a deal has been struck with the PSCU to make it easy for credit unions to do the same.

Dekkers Davidson, head, mobile commerce, Barclaycard US, says: "Google Wallet is a compelling solution for consumers that makes doing business faster and more rewarding and will make the experience with Barclaycard even more simple and easy to use."

Meanwhile, one of Google Wallet's main challengers, the telco-led Isis venture - which Barclaycard is also backing - has delayed its launch. The firm had planned to begin its first commercial trials in by the middle of this year, starting with locations across Salt Lake City and Austin, Texas.

However, head of marketing, Jaymee Johnson, has now told Reuters that not only has the project been delayed but that Isis will not even reveal when the launch will be until October.

Another potential rival, Apple, earlier this week again snubbed the contactless option, omitting NFC from the iPhone 5.