curl --request GET \
  --url https://openapi.pluuug.com/v1/field \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Signature: <api-key>'

{
  "results": [
    {
      "id": 123,
      "name": "<string>",
      "optionSet": [
        {
          "id": "<string>",
          "title": "<string>"
        }
      ],
      "memberSet": [
        {
          "id": 123,
          "nickname": "<string>",
          "email": "<string>",
          "isActive": true,
          "grade": {
            "id": 123,
            "title": "<string>"
          }
        }
      ]
    }
  ],
  "next": "http://api.example.org/accounts/?cursor=cD00ODY%3D\"",
  "previous": "http://api.example.org/accounts/?cursor=cj0xJnA9NDg3"
}