IGPAPI
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    Variable ReelsViewerInputSchemaConst

    ReelsViewerInputSchema: Struct<
        {
            chainingPosition: optionalKey<Union<readonly [Number, String]>>;
            chainingSeedMediaId: optionalKey<String>;
            chainingSessionId: optionalKey<String>;
            clientPosition: optionalKey<Union<readonly [Number, String]>>;
            mediaId: String;
            mediaPctWatched: optionalKey<Union<readonly [Number, String]>>;
            rankingSessionId: optionalKey<String>;
            storyRankingToken: optionalKey<String>;
        },
    > = ...

    The viewer's input: the reel it shows plus its chaining session.