The GfpRewardedAd interface represent a rewarded ad.
Indicate whether the ad is still valid.
Returns true if the rewarded ad has been successfully loaded.
true
Closes the rewarded ad.
Destroys an interstitial ad.
Checks if server-side verification is being used for the rewarded ad.
Loads an rewarded ad.
Requests server-side verification for the rewarded ad. This is only valid if the ad is able to get reward and server-side verification is enabled.
Shows the rewarded ad.