OptionalavatarA custom message icon URL. The image must be JPG, PNG, or GIF format.
OptionaldisplayThe display name of the message author.
OptionalsubtypesA string array that indicates the author's subtypes. Messages from "business" type with an "AI" subtype are generated by AI and a disclaimer is appended to the text of the message sent to the customer. For third-party channels, the disclaimer is applied for image, file, and text message types. Message with an "activity" subtype are generated by system activities.
The author type. Either "user" (representing the end user) or "business" (sent on behalf of the business).
OptionaluserThe id of the user. Only supported when type is user.
The author of the message.