This is an add-on feature of Notificare. You will need to subscribe to this add-on as described here before you can use this functionality. With the Monetize add-on you can easily manage and sell virtual goods in Google Play. Our library will provide all you need to use the Google's In-App Billing API to sell digital goods directly from your app.
If you meet the requirements above, go ahead and learn how to setup Notificare's Monetize add-on and create products for Google Play by proceeding to the Setup guides.