curl --request GET \
  --url https://api.scribe-mail.com/v1/smart_fields \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "label": "<string>",
      "slug": "<string>",
      "required": true,
      "default": true,
      "position": 123,
      "integration_id": "<string>",
      "integration_attribute": "<string>",
      "used_in_signatures": true,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "pagination": {
    "next_cursor": "<string>",
    "has_more": true,
    "limit": 123
  }
}