There’s been a lot of talk about mobile payments, and we’ve been hearing the names of the heavy hitters often—Google, PayPal, Square and LevelUp. Last year, in the US, Smartphone users spent nearly $500 million on goods and services. It’s a considerable amount of money, so you may be surprised to learn that Starbucks’s own mobile payment app is stomping all over the competition.

A story on Gigaom.com highlights Starbucks’ success and notes that part of it has to do with the app’s simplicity. There’s no guesswork involved, for example—what mobile payment platforms are accepted or how difficult it would be to actually pay with a phone.  The Starbucks app is easy–anyone with the Starbucks mobile payment app can go into a store and use the app to pay for their choice of food, beverage or merchandise.

The coffee purveyor reports that that it processes more than three million mobile transactions per week. And although other mobile payment providers are expected to pull ahead in the next few years, right now coffee lovers are happy to present their phone when it comes time to check out.