Method ShowRewardedAd
ShowRewardedAd(Action<bool, int>)
Shows the highest-eCPM ready rewarded unit. In the Editor, always invokes the callback with
(true, 0) so game flow can be tested without a real device. The callback receives
(true, durationSeconds) when the user completes the ad, or (false, 0) otherwise.
public static void ShowRewardedAd(Action<bool, int> onClosed)