private static extern void FBRewardedVideoAdBridgeOnServerRewardFailure(int uniqueId, FBRewardedVideoAdBridgeExternalCallback callback);
private static extern void FBRewardedVideoAdBridgeOnWillClose(int uniqueId, FBRewardedVideoAdBridgeExternalCallback callback);
private static extern void FBRewardedVideoAdBridgeOnVideoComplete(int uniqueId, FBRewardedVideoAdBridgeExternalCallback callback);
private static extern void FBRewardedVideoAdBridgeOnImpression(int uniqueId, FBRewardedVideoAdBridgeExternalCallback callback);