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Game of War and Mobile Strike pay out well. Not sure about anything else.

Email them if you do not receive the platinum after installing and running the apps. You will then get an automatic reply asking for proof (e.g. a screenshot of you running the app, showing the level...

Email the provider, I have always been given my platinum (except from Tapjoy those greedy such and suches), I honestly only go for the large paying offers. #SizeMatters (I had to!)