RewardedInterstitialAd.load(MainActivity.this, "ca-app-pub-3940256099942544/5354046379", new AdRequest.Builder().build(), new RewardedInterstitialAdLoadCallback() { @Override public void onAdLoaded(RewardedInterstitialAd ad) { Log.d(TAG, "Ad was loaded."); rewardedInterstitialAd = ad; ServerSideVerificationOptions options = new ServerSideVerificationOptions .Builder() .setCustomData("SAMPLE_CUSTOM_DATA_STRING") .build(); rewardedInterstitialAd.setServerSideVerificationOptions(options); } @Override public void onAdFailedToLoad(LoadAdError loadAdError) { Log.d(TAG, loadAdError.toString()); rewardedInterstitialAd = null; } });