## PlaybackEvent

#### Payload Schema

- **command** (string, required)
Identifies the type of playback event.
Enum: textPlaybackStart, textPlaybackStop, textPlaybackCancel
- **batchSequence** (integer, required)
Auto-incrementing sequence number that identifies the TTS batch this event relates to.


The sequence starts at `0` for the first batch sent after the session is accepted and
increments by `1` for each subsequent batch. Use this value to correlate playback
events with the `textResponse` messages sent from the server.