InterstitialAdHandler

// Instantiate
val ad = InterstitialAd(activity)
// Load the Ad
ad.load(
  adUnitId = "AD_UNIT_ID_GOES_HERE", // Interstitial Ad Unit ID from AdMob
  onLoad = {
  // ad.setListeners could go here instead
  },
  onFailure = {  } // Callback when ad fails to load
)
// (optional) Observe what happens to the ad after it's shown
ad.setListeners(
  onFailure = {}, // Callback when ad fails to display
  onDismissed = {}, // Callback when ad is dismissed
  onShown = {}, // Callback after ad is shown
  onImpression = {}, // Callback after the ad makes an impression
  onClick = {} // Callback on ad click
)
// Show the ad
ad.show()