The behavior I am creating is that a OAS ad appears and if it fails then an iAd appears and if it also fails an AdMob ad appears. It should cycle through the three choices on a rotation. At the moment, I am seeing iAd only or direct ad only. I have not seen any AdMob ads appear. Do anyone has a way of setting this up so that the three ad networks rotate?
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Maybe Adwhirl is what you're looking for. https://www.adwhirl.com/