public void CreateInterstitialAd(string placementId, string channelId, string versionId) { this.interstitialClientPtr = (IntPtr)GCHandle.Alloc(this); this.InterstitialPtr = YumiExterns.InitYumiInterstitial(this.interstitialClientPtr, placementId, channelId, versionId); YumiExterns.SetInterstitiaCallbacks( this.InterstitialPtr, InterstitialDidReceiveAdCallback, InterstitialDidFailToReceiveAdWithErrorCallback, InterstitialDidClickCallback, InterstitialDidCloseCallback); }