curl --request POST \
  --url https://your-instance.example.com/api/contact-notes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contactId": "<string>",
  "note": "<string>",
  "mentions": [
    "<string>"
  ],
  "attachments": [
    {
      "key": "<string>",
      "name": "<string>",
      "size": 123,
      "type": "<string>"
    }
  ]
}
'

{}