curl --request POST \
  --url https://api.kajabi.com/v1/contact_notes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "attributes": {
      "body": "<string>"
    },
    "relationships": {
      "contact": {
        "data": {
          "id": "<string>",
          "type": "<string>"
        }
      }
    }
  }
}
'

{
  "data": {
    "id": "<string>",
    "attributes": {
      "body": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    },
    "relationships": {
      "contact": {
        "data": {
          "id": "<string>",
          "type": "<string>"
        }
      }
    }
  },
  "links": {
    "self": "<string>",
    "current": "<string>"
  }
}