How do you, as a developer, secure a paid app in android market? I am not asking for technical information but rather what is the information model between android market and the developer, such that the developer can automate registration and unlock the application? If the app must implement registration, as it seems android market does not, how does the app know that the user has paid? I know google checkout supports dynamic information flow, but android market controls the checkout, so the developer does not have access to customer information during the checkout process, correct? How does one verify a paid customer?