Android Pay has launched in the US to take on Apple Pay, and is now available in one million locations.
Pali Bhat, director of product management at Android Pay, revealed the rollout on the Android blog, explaining how Google's near-field communication (NFC) smartphone payments service will store loyalty cards and special offers as well as bank card details.
"We'll be rolling out gradually over the next few days, and this is just the beginning. We will continue to add even more features, banks and store locations in the coming months, making it even easier to pay with your Android phone," he said.
Android Pay will be available on US smartphones running Android 4.4 Kitkat or above on smartphones with an NFC chip.
Four major payment networks are supporting the rollout of Android Pay - American Express, Discover, MasterCard and Visa - which are also partners of Apple Pay.
Bhat said that more banks and payments firms will be added to the Android Pay roster as the rollout expands in the US.
Big international brands supporting Android Pay include Coca-Cola, Subway, Whole Foods, Staples and Pepsi. US retail companies include Macy's and American Eagle.
Bhat said that Google has plans to evolve Android Pay beyond contactless in-store payments.
"Later this year, you'll also be able to use Android Pay to speed through mobile checkout in your favourite apps. And with selected merchants, you'll soon be able to transmit your loyalty cards and special offers with just a tap," he said.
Unfortunately for UK Android fans, Bhat did not reveal when Android Pay will be available in UK retail outlets.
Apple Pay has already gone live in the UK, so Apple's contactless payment service has stolen the march on Google.
However, Samsung is planning to launch its take on contactless payments, imaginatively named Samsung Pay, and the world of smartphone contactless payments could witness a Mexican standoff.
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