I have a received a mail from Google mentioning 'we will end support for the In-app Billing Version 2 API. After this date, users will no longer be able to make in-app purchases using your app until you upgrade your app to use the Version 3 API.' And they have detected that my app have had a transaction on the v2 API recently.

I have implemented and using In App Billing Version 3 API for 'in app subscription' for my Android app like an year ago, from the very first day. And app transactions are going on successfully. I have checked <http://developer.android.com/google/play/billing/billing_integrate.html> again and everything looks right. I have added IInAppBillingService.aidl and in IABHelper it shows me that In-app-billing v3 is implemented.

Could anyone please suggest how to know whether my app has been using In App Billing V2? And if necessary, how do I remove In App Billing V2 components? Do I need to update anything for In App Billing Version 3 again? Appreciate your suggestions.