Back in the days, you could fix incompatibility issues with these two extensions that causes compilation errors by manipulating some manifest files. The instructions posted back then on the Forum seems to be out of date (here). At least I tried editing the AndroidManifest.xml as said there, and I still can't compile a project that has both Admob and OneSignal in it... :-(
Can someone please explain how to have these two extensions on the same project and compiling an apk successfully? Is there any way, am I missing something?