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                  The source ad server information included in the ad response. DeclarationSwift var adSystem: String? { get }
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                  The identifier of the selected creative for the ad. DeclarationSwift var creativeId: String? { get }
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                  The list of wrapper ad identifiers as specified in the VAST response. DeclarationSwift var wrapperAdIds: [String] { get }
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                  The list of wrapper ad systems as specified in the VAST response. DeclarationSwift var wrapperAdSystems: [String] { get }
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                  The list of wrapper creative identifiers. DeclarationSwift var wrapperCreativeIds: [String] { get }
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                  The bitrate of the currently playing creative as listed in the VAST response. DeclarationSwift var vastMediaBitrate: Int { get }
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                  The list of universal ad ID information of the selected creative for the ad. DeclarationSwift var universalAdIds: [UniversalAdId] { get }
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                  The String representing custom trafficking parameters from the VAST response. DeclarationSwift var traffickingParameters: String { get }
