I do not recommend CPIMobi, they don’t deliver and what they deliver is not qualified for you app 95%. I ran 3 campaigns with the baddest experience in that service. Still some dollars (credits) locked with they, no way to deliver or to have the money back. Skype support is mute. One of the many campaigns I trying is to deliver 90 downloads in 10 countries and they did 19 from November 2018 until now. Sad.
