AI-generated Key Takeaways
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          GADRTBRequestParameters contains request parameters provided by the publisher and Google Mobile Ads SDK. 
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          The configuration property provides mediation configuration set by the publisher on the AdMob UI. 
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          The extras property contains extras registered by the publisher with -[GADRequest registerAdNetworkExtras:]. 
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          The adSize property indicates the requested banner ad size, which is GADAdSizeInvalid for non-banner requests. 
GADRTBRequestParameters
@interface GADRTBRequestParameters : NSObjectRequest parameters provided by the publisher and Google Mobile Ads SDK.
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                  Mediation configuration for this request set by the publisher on the AdMob UI. DeclarationSwift var configuration: RTBMediationSignalsConfiguration { get }Objective-C @property (nonatomic, readonly, nonnull) GADRTBMediationSignalsConfiguration *configuration;
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                  Extras the publisher registered with -[GADRequest registerAdNetworkExtras:]. DeclarationSwift var extras: (any AdNetworkExtras)? { get }Objective-C @property (nonatomic, readonly, nullable) id<GADAdNetworkExtras> extras;
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                  Requested banner ad size. The ad size is GADAdSizeInvalid for non-banner requests. DeclarationSwift var adSize: AdSize { get }Objective-C @property (nonatomic, readonly) GADAdSize adSize;