type: object
properties:
  id:
    type: integer
    description: Id of the message
  content:
    type:
      - string
      - 'null'
    description: Text content of the message. Can be null for attachment-only messages.
  message_type:
    type: integer
    description: "Denotes the message type. Possible values: 0 (incoming), 1 (outgoing), 2 (activity), 3 (template)"
  content_type:
    type: string
    description: Content type of the message
  content_attributes:
    type: object
    description: Additional content attributes of the message
  created_at:
    type: integer
    description: Created at Unix timestamp of the message
  conversation_id:
    type: integer
    description: Display Id of the conversation the message belongs to
  attachments:
    type: array
    description: Attachments if any
    items:
      $ref: '#/components/schemas/public_message_attachment'
  sender:
    $ref: '#/components/schemas/public_message_sender'