GADMediationAdRequest
@protocol GADMediationAdRequest <NSObject>Provides information which can be used for making ad requests during mediation.
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                  Publisher ID set by the publisher on the AdMob frontend. DeclarationSwift func publisherId() -> String?Objective-C - (nullable NSString *)publisherId;
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                  Mediation configurations set by the publisher on the AdMob frontend. DeclarationSwift func credentials() -> [AnyHashable : Any]?Objective-C - (nullable NSDictionary *)credentials;
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                  Returns YES if the publisher is requesting test ads. DeclarationSwift func testMode() -> BoolObjective-C - (BOOL)testMode;
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                  The adapter’s ad network extras specified in GADRequest. DeclarationSwift func networkExtras() -> (any AdNetworkExtras)?Objective-C - (nullable id<GADAdNetworkExtras>)networkExtras;
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                  Returns the value of childDirectedTreatment supplied by the publisher. Returns nil if the publisher hasn’t specified child directed treatment. Returns @YES if child directed treatment is enabled. DeclarationSwift func childDirectedTreatment() -> NSNumber?Objective-C - (nullable NSNumber *)childDirectedTreatment;
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                  Returns the maximum ad content rating supplied by the publisher. Returns nil if the publisher hasn’t specified a max ad content rating. DeclarationSwift func maxAdContentRating() -> GADMaxAdContentRating?Objective-C - (nullable GADMaxAdContentRating)maxAdContentRating;
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                  Returns the value of underAgeOfConsent supplied by the publisher. Returns nil if the publisher hasn’t specified the user is under the age of consent. Returns @YES if the user is under the age of consent. DeclarationSwift func underAgeOfConsent() -> NSNumber?Objective-C - (nullable NSNumber *)underAgeOfConsent;
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                  Keywords describing the user’s current activity. Example: @“Sport Scores”. DeclarationSwift func userKeywords() -> [Any]?Objective-C - (nullable NSArray *)userKeywords;