Thank you! This method still works as of 22 September 2020!How I did it, in lucky patcher, I click on the prison boys that I downloaded from google play store and click "create modified APK file". When you hit that button, press on "APK rebuilt for InApp and LVL emulation." It will then show 3 options after you press that and check ONLY the middle box which says "Support patch for InApp emulation" after that and the app loaded, press on "go to file" and then "Uninstall and Install". After you did that, you should be able to purchase everything