The author of the message.
| Name | Type | Description | Notes |
|---|---|---|---|
| type | str | The author type. Either "user" (representing the end user) or "business" (sent on behalf of the business). | |
| subtypes | list[str] | A 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. | [optional] |
| user_id | str | The id of the user. Only supported when `type` is user. | [optional] |
| user_external_id | str | The externalId of the user. Only supported when `type` is user. | [optional] |
| display_name | str | The display name of the message author. | [optional] |
| avatar_url | str | A custom message icon URL. The image must be JPG, PNG, or GIF format. | [optional] |