Less than a month after rolling out its mobile payment technology across the United States, coffee giant Starbucks says its customers have made 1 million payments via the app-based system -- which stores a virtual Starbucks Card on a mobile phone, for scanning at the register.

The Seattle-based company also promised an Android mobile payment app to complement its existing iPhone and BlackBerry apps.

Starbucks' announcement comes on the same day that Apple announced new rules for in-app subscription and content payments on the iPhone and iPad, saying that it would be keeping 30 percent of those sales as it does with other in-app purchases. We've contacted Apple and Starbucks representatives to see if the new system changes the underlying revenue-sharing model for the Starbucks app.

Update: Apple spokeswoman Trudy Muller said the company does not plan to take a 30 percent cut of value added to Starbucks Cards via the apps. The revenue-sharing model is for digital goods, she explained, not for virtual stored-value cards.

Previously: How to buy a vanilla bean Frappuccino with your iPhone