Optionalclient: ClientThe owning client, stored for later convenience calls.
OptionalclientThe client that created this model, used by convenience methods.
OptionalcontextContext kind (for example playlist, album, radio).
OptionalcontextIdentifier of the context item.
OptionalpayloadContext payload (free-form raw JSON, pending a typed model).
OptionaltracksTracks recently played in this context.
A "continue listening" context (where playback last happened).