Hi cupic, we had several complaints from advertisers about the way you were showing ads. It looks like you were offering incentives that couldn't be delivered, as there was no way for you to know which users had installed the apps advertised without a callback. Misleading users violates both our terms and Google Play's, and since you were getting an install rate of nearly 100%, advertisers were obviously upset so we gave them a refund. It's important for the health of the whole network that everyone uses fair practices.
There are many ways you can optimize your integration that won't cause these problems. If anyone wants advice on improving their IR without offering incentives, feel free to get in touch at
[email protected], or take a look at these articles:
Increasing eCPM
Avoiding monetization mistakes
Fixing a low fill rate or eCPM with AppFlood