The following fields are returned when user posts a private note.
|id||Int||1351||Unique identifier of private note|
|user_id||Int||12||Unique identifier of user who made this private note|
|ticket_id||Int||57182||Unique identifier of ticket which belongs this private note|
|message||String||Hi @zureal, can you handle this ticket?||Message of the private note|
|created_at||Datetime||2015-01-23T12:34:12.000Z||UTC time when this private note was created|
|updated_at||Datetime||2015-03-02T09:22:11.000Z||UTC time when this private note was last updated|