curl --request GET \
  --url https://api.fint.app/api/v1/event/page/{eventPageId}/custom-fields \
  --header 'x-api-key: <api-key>'

[
  {
    "id": 123,
    "eventPageId": 123,
    "label": "<string>",
    "description": "<string>",
    "type": "text",
    "isRequired": true,
    "whoType": "allItems",
    "order": 123,
    "active": true,
    "options": [
      {
        "id": 123,
        "value": "<string>",
        "label": "<string>",
        "order": 123
      }
    ],
    "items": [
      {
        "id": 123,
        "name": "<string>",
        "description": "<string>",
        "type": "credit",
        "amount": 123,
        "status": "active"
      }
    ]
  }
]