Mark Chat as Unseen

curl --request POST \
  --url https://api.useinvent.com/chats/{chat_id}/state/unseen \
  --header 'Authorization: Bearer <token>'

{
  "chat_id": "<string>",
  "assigned_user_id": "<string>",
  "admin_unseen_count": 123,
  "user_unseen_count": 123
}