curl --request POST \
  --url https://api.hyperspell.com/messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "source": "<string>",
  "messages": [
    {
      "resource_id": "<string>",
      "message_id": "<string>",
      "content": "<string>"
    }
  ]
}
'

{
  "count": 123
}