2026-05-02 Message API
- New optional
mark_thread_as_readfield added toPOST /v1/message/messagesandPOST /v1/message/drafts, controlling whether sending a reply marks the thread as read for the sender's org/user (defaults totrue)
mark_thread_as_read field added to POST /v1/message/messages and POST /v1/message/drafts, controlling whether sending a reply marks the thread as read for the sender's org/user (defaults to true)