MasterCard is expanding Masterpass from online to in-store payments.

Masterpass is already available for in-app payments or online retailers, which typically provide a button in their shopping carts that allows shoppers to check out with the credit cards they've added to their Masterpass account. But now, the company is expanding to physical stores, where customers can use mobile phones to pay with Masterpass at the register, just as they would with offerings from Samsung, Apple, or Google.

In-store Masterpass is initially only available in the Android version of the app in the US, as iPhones currently only support Cupertino's own payment system.

As part of the contactless rollout, MasterCard is also enhancing functionality for Masterpass users who prefer to pay directly from their bank accounts. About 20 US banks—including Bank of America, Capital One, KeyBank, and SunTrust—will support Masterpass, so you can pay with MasterCard's service via your bank's app.

Masterpass arrives in the US later this month, and in Europe and the Middle East/Africa by year's end.