Amazon.com Inc. is expanding the use of its digital currency, Amazon Coins, to all apps and games in the mobile Amazon Appstore.

Previously, Amazon Coins could be used only to make purchases on the Kindle Fire tablet and on Amazon's regional Web app stores. Customers' Coins are now automatically transferred to their Android device so they can spend Coins on more than 100,000 games and apps in Amazon's mobile store.

"Since the launch of Amazon Coins, we've been amazed by the number of customers using Coins, as well as how many Coins they're spending on apps and games," says Mike George, vice president of Amazon Appstore and Games, in a Feb. 19 press release. "Because customers can earn Coins when they buy apps in Amazon's Appstore, and because they can buy Coins themselves at up to a 10% discount, customers love the extra value they get when shopping in our Appstore."

To use Coins on Android devices, customers must download the latest version of the Amazon Appstore.

"I bought these Coins so I don't have a lot of little purchases on my credit card. I balance every single purchase I make, so writing down a silly 99 cent purchase my kids make can be annoying," says an Amazon customer identified as "J" in the press release. "I buy $10 worth of Coins every few months and I save 50 cents."

Appstore developers earn the standard 70% revenue share when customers buy their product with Amazon Coins.

Amazon Coins went live in May 2013 in the U.S., with many customers commenting on the product page that the alternative payment method could be successful if the company allowed Coins to be used across more platforms. In November, Amazon began offering the digital currency to consumers in the U.K. and Germany

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