In-App Billing: Getting User is not eligible to purchase

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http://stackoverflow.com – I know about all the user account specification and where to register for the test account in developer console. Question: To which user this message is referring? The user that is currently logged in google play on device? if yes. Why it is giving the same message even if there aren't any users logged in google play? There is many google accounts on this device. maybe this message is referring to the default one. how to change it. (the default one: is when u clear google play data, then open google play it will force you to log in with). When you are not logged in google play. why when you (HowTos)