AI-generated Key Takeaways
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          GADMediationRewardedAdEventDelegate reports rewarded ad information to the Google Mobile Ads SDK from the adapter. 
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          The didRewardUsermethod notifies the SDK that the ad has rewarded the user.
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          The didStartVideomethod notifies the SDK that the video playback has started.
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          The didEndVideomethod notifies the SDK that the video playback has finished.
GADMediationRewardedAdEventDelegate
@protocol GADMediationRewardedAdEventDelegate <GADMediationAdEventDelegate>Reports rewarded related information to the Google Mobile Ads SDK from the adapter.
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                  Notifies the Google Mobile Ads SDK that the GADMediationAd has rewarded the user. DeclarationSwift func didRewardUser()Objective-C - (void)didRewardUser;
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                  Notifies Google Mobile Ads SDK that the GADMediationAd started video playback. DeclarationSwift func didStartVideo()Objective-C - (void)didStartVideo;
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                  Notifies Google Mobile Ads SDK that the GADMediationAd’s video playback finished. DeclarationSwift func didEndVideo()Objective-C - (void)didEndVideo;