I have moved my project to 2019.1 from 2018.2.20 where everything worked. For 2019 I also updated IAP to 1.22. I'm basically using a modified version of IAPDemo.cs, which is attached to this thread. The first time the app is launched after installation OnInitialized is called which I can see in the log: "OnInitialized: PASS" Then all the products show up as intented. From the 2nd app launch on neighter the OnInitialized nor the OnInitializeFailed callbacks are called. - no exception just silence! Also, it does not help to delete files from the android/data folder. I have seen, that the new IAPdemo.cs is different a lot. But shouldn´t it be backwards compatible? It works on iOS without any problems. So is there anything that has to be changed?