The author of the activity.
| Name | Type | Description | Notes |
|---|---|---|---|
| type | str | The `type` of the author. | |
| user_id | str | The id of the user. Only supported when author `type` is `user`. | [optional] |
| user | User | The user that authored the message or activity. `profile` is included in the payload if the `includeFullUser` option is enabled. | [optional] |