List all fields

curl --request GET \
  --url https://api.xoxo.email/v1/fields \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "variable": "<string>",
      "kind": "text",
      "position": 123,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "meta": {
    "current_page": 123,
    "per_page": 123,
    "total": 123,
    "last_page": 123
  }
}