A bit more than a year ago, we released the Qt Purchasing module as part of our commercial offering. This module provides cross-platform APIs to enable in-app purchases in your application, and the current released version works together with the app store on iOS and the Google Play store on Android.
Recently, however, we decided to release the module into open source under LGPLv3 in Qt 5.7,
Source: Ziobudda.net