The right approach:
- Create a banner with the mediation ID.
- When setting up this mediation location on admob.com, configure AdMob as one of the ad networks in this reseller placement. If you want AdMob to be requested first every time, use an eCPM order and give AdMob the highest effective CPM.
As such, Mediation will always request an AdMob ad. If this fails, Mediation will automatically try your next network for you. This saves you from having to follow this retry logic yourself. onFailedToReceiveAd will only be called if all ad networks have failed to return the ad.
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