AI-generated Key Takeaways
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          GADResponseInfo provides information about a response to an ad request. 
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          It includes a unique identifier for the ad response. 
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          Extra parameters returned in the ad response are available in a dictionary. 
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          Information about the loaded ad network is provided, or nil if the ad failed to load. 
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          Metadata for each ad network in the response is available in an array. 
GADResponseInfo
@interface GADResponseInfo : NSObjectInformation about a response to an ad request.
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                  Unique identifier of the ad response. DeclarationSwift var responseIdentifier: String? { get }Objective-C @property (nonatomic, readonly, nullable) NSString *responseIdentifier;
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                  Dictionary of extra parameters that may be returned in an ad response. DeclarationSwift var extras: [String : Any] { get }Objective-C @property (nonatomic, readonly, nonnull) NSDictionary<NSString *, id> *extrasDictionary;
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                  The GADAdNetworkResponseInfo corresponding to the adapter that was used to load the ad. Nil if the ad failed to load. DeclarationSwift var loadedAdNetworkResponseInfo: AdNetworkResponseInfo? { get }Objective-C @property (nonatomic, readonly, nullable) GADAdNetworkResponseInfo *loadedAdNetworkResponseInfo;
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                  Array of metadata for each ad network included in the response. DeclarationSwift var adNetworkInfoArray: [AdNetworkResponseInfo] { get }Objective-C @property (nonatomic, readonly, nonnull) NSArray<GADAdNetworkResponseInfo *> *adNetworkInfoArray;
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                  JSON-safe dictionary representation of the response info. DeclarationSwift var dictionaryRepresentation: [String : Any] { get }Objective-C @property (nonatomic, readonly, nonnull) NSDictionary<NSString *, id> *dictionaryRepresentation;