Optionalagent_For messages that are sent between the user and a human agent, we assign an agent type to the message to distinguish what type it is.
Optionalalt_The alt text for labeling the item. Screen readers will announce this text when the user's virtual cursor is focused on the item.
OptionaldescriptionThe description for the item.
OptionaldimensionsSettings that control the dimensions for the media item.
Optionalmessage_Options that control additional features available for a message item.
The response type of this message item.
The url pointing to a media source, whether audio, video, or image.
For video this can be a file like an .mp4 or a YouTube, Facebook, Vimeo, Twitch, Streamable, Wistia, or Vidyard url.
For audio this can be a file like an .mp3 or a SoundCloud or Mixcloud url.
Optionalstreaming_Metadata used identify a generic item within the context of a stream in order to correlate any updates meant for a specific item.
OptionaltitleThe title for the item.
Optionaluser_An optional buckets of additional user defined properties for this item.
A reusable media object that may need to display a title and description with an alt_text to label the item for accessibility purposes. This is used by the Audio, Video and Image response types.