good for you, i see no ads on my application :'( cant find what i did wrong;
* i published application first
* then i did what i had to do in admob (getting banner id unit to use it in mopub "ca-app-pub..."
* then i did what i had to do in mopub (integrating admob with mopub and getting ad id unit "fb...")
* then i did what i had to do in ludei (using id unit i created on mopub which starts with "fb..."
that is what i understood from guides, id like to be advised if theres a mistake :/