UnityAds実装する

 //namespace宣言
 using UnityEngine.Advertisements;
 ...
        private void Start()
        {
            //初期化
#if UNITY_ANDROID
            Advertisement.Initialize(googleid);
#elif UNITY_IOS
            Advertisement.Initialize(appid);
#else
#endif
        }

        //広告呼び出し
        public void ShowRewardedAd()
        {
            if (Advertisement.IsReady("rewardedVideo"))
            {
                var options = new ShowOptions { resultCallback = HandleShowResult };
                Advertisement.Show("rewardedVideo", options);
            }
        }

        //広告結果イベント
        private void HandleShowResult(ShowResult result)
        {
            switch (result)
            {
                //最後まで終了
                case ShowResult.Finished:
                    Debug.Log("The ad was successfully shown.");
                    Finished();
                    break;
                //途中スキップ
                case ShowResult.Skipped:
                    Skipped();
                    Debug.Log("The ad was skipped before reaching the end.");
                    break;
                //表示失敗
                case ShowResult.Failed:
                    Failed();
                    Debug.LogError("The ad failed to be shown.");
                    break;
            }
        }
 ...