There's no such thing as "your own Android app", unless the apk is sideloaded. All apps downloaded by users from Google Play are essentially Google's, if you are not "too big to get banned."

[1] Developers offering products within another category of app downloaded on Google Play must use Google Play In-app Billing as the method of payment, except for the following cases:

    Payment is solely for physical products

    Payment is for digital content that may be consumed outside of the app itself (e.g. songs that can be played on other music players)

1. https://play.google.com/about/monetization.html