Epom

Obtain adclient-sdk-for-android-3.9.(aar).zip from Epom. It has a PDF file with detailed instructions.

Their technical support does not exist.  If one sends a technical question, they don't bother to reply though they respond to non-technical question.  

You can spend many hours to set up Epom ad display in an app, but their server may not serve a single ad probably due to a technical glitch, and they will not solve the problem because it is a technical issue.  

In summary, using Epom could potentially a disaster - nothing works after many hours spent.