Add or remove an emoji reaction on a message.
Reactions are INTERNAL — never visible to end customers, never fire webhooks/SLA/unread, never move the ticket's latest message. The update reaches open dashboards via the ordinary comment.updated broadcast.
Bearer <token>.The unicode emoji, e.g. "👍" or "👨👩👧". Validated server-side (pictographic/keycap/flag required, max 32 UTF-16 units).
Ok