AI-generated Key Takeaways
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          GADRTBRequestParametersholds request parameters provided by the publisher and the Google Mobile Ads SDK.
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          The configurationproperty contains mediation configuration set by the publisher.
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          The extrasproperty includes any ad network extras registered by the publisher.
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          For banner requests, the adSizeproperty indicates the requested banner ad size.
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;