Note that the Audio data type falls under the Message data type.

Audio

This object represents an audio file.

Field	Type	Required	Description
id	String	Yes	Unique identifier for this file
duration	Integer	Yes	Duration of the audio file
performer	String	Optional	Performer of the audio as defined by sender or by audio tags.
title	String	Optional	Title of the audio of the audio as defined by sender or by audio tags
size	Integer	Yes	Audio file size