type: object properties: id: type: string description: Id of the message content: type: string description: Text content of the message message_type: type: string description: Denotes the message type content_type: type: string description: Content type of the message content_attributes: type: string description: Additional content attributes of the message created_at: type: string description: Created at time stamp of the message conversation_id: type: string description: Conversation Id of the message attachments: type: array items: type: object description: Attachments if any sender: type: object description: Details of the sender