Update a message

Edit an existing message. Only data (the message content, e.g. data.content as TipTap JSON) and attachments are persisted; all other schema properties are ignored, and data is replaced wholesale (an omitted data clears the content). Agents may only edit their own messages, sent through the widget or email channel, that the contact has not read yet and that are less than 2 minutes old; own internal notes can be edited at any time.