In-App Purchase Native Extension - how can I check If user have purchased the in-app already?

HI!

I have an application with In-app purchase. I use ProductStore -  Adobe's native extension to connect to iTunes (com.adobe.ane.productStore Summary). I can make the purchase with the ANE, but I didn't find the way to check if the app was already purchased:   I need for the case when user wants to install the app to additional device, or if user have remove the app and install it again.

And if there's no way, may somebody knows other Native extension that can provide the corresponding functionality.

Thank you in advance,

Olga