Payload of the request to reply on behalf of a contact using their user_id
A list of files that will be added as attachments. You can include up to 10 files.
The time the reply was created. If not provided, the current time will be used.
Example: 1590000000
{ "user_id": "string", "attachment_files": [ { … } ], "message_type": "comment", "type": "user", "body": "string", "created_at": 1590000000, "attachment_urls": [ "http://example.com" ] }