Buying soundsets through Google Play


Hi guys! I read here that it was possible, at least some time ago, to buy soundsets directly through Google Play. Since I have some funds in Google Play, I wanted to do just that, but trying to buy a soundset through the app sends you to the webpage, in which you have to pay through PayPal. Could you please indicate me how to buy the soundset through Google Play? A search in the Play Store gives no results.

Kind regards