I know this is a real noob question. I'm not really an Android noob - I own 3 Android devices and work as an Android programmer - but we ship our products with our app already installed on custom Android devices, so I have very little dealing with Google Play. I've downloaded lots of free apps for my 2 Android phones and my tablet, but I've never bought an app. How do you pay for it? I don't want to leave a credit-card on file with anyone. Both my Mastercard (Citibank) and my Visa card (BankofAmerica) let me create "virtual" account numbers - these are single-use credit card numbers and that's how I buy stuff online all the time. I sometimes see pay apps that I want to buy but I don't know how to pay for them.