Conquered Android IAP. Build QML api that can be used for apps and games. Full Android in-app flow using Android Java basis from Google (from https://code.google.com/p/marketbilling/). Then using Qt5.2 easy JNI interface (QAndroidJniObject::callStaticMethod) for accessing Java functions. Magic started to happen when non-static functions via static interface was reached using runOnUiThread in Java-code!