AdInstance = function (placementID, instance, video)
{
    return {
        instance: instance,
        placementID: placementID,
        shown: false,
        video: video
    };
}
@typedef {object} AdInstance

@property {any} instance - Represents an instance of an ad.
@property {string} placementID - The Audience Network placement ID of this ad instance.
@property {boolean} shown - Has this ad already been shown in-game?
@property {boolean} video - Is this a video ad?