curl --request POST \
  --url https://inboxapp.com/api/v1/threads/{threadId}/messages/{messageId}/reactions/reactions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "emoji": "<string>"
}
'

{
  "success": true,
  "messageId": "<string>"
}