what is the Easiest way bill after 7 days Android Play free app, one time fee...?
May implement my self using Paypal(www) and PHP/MySQL/ajax/jQ in the app? In this case Paypal should accessed either from mobile device or desktop?
If it's a free app, you don't implement payment at all. You can, however, show an annoying page ad directing the user to the paid app.
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