Call UnityAds.initialize('your_game_android', 'your_game_ios', this, testMode: !kReleaseMode)
during app initialization.
UnityAds.show('#placement');
void onUnityAdsError(UnityAdsError error, String message);
void onUnityAdsFinish(String placementId, FinishState result);
void onUnityAdsReady(String placementId);
void onUnityAdsStart(String placementId);
Implement Banner and plugin for iOS platform.