curl --request GET \
  --url https://api.sentvia.ai/v1/threads/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "subject": "<string>",
  "last_message_at": "<string>",
  "messages": [
    {
      "id": "<string>",
      "thread_id": "<string>",
      "direction": "<string>",
      "from_addr": "<string>",
      "to_addrs": [
        "<string>"
      ],
      "subject": "<string>",
      "body_text": "<string>",
      "delivery_status": "<string>"
    }
  ]
}