"The setting of Managed vs. unmanaged means that ludeis cloud thing will take care of some of it for you.
Warning if you set it to unmanaged the Purchase completed event will not be triggered." ~https://www.scirra.com/tutorials/645/in-app-purchase-on-google-play-android-using-cocoonjs/page-3
So basically by setting it as unmanaged you risk the possibility that people could buy your app without actually paying for it. Unless you build your own authentication processes which is probably what clause did in something other than C2.