curl --request GET \
  --url https://api.heffl.com/api/v2/forms/{id}/fields \
  --header 'x-api-key: <api-key>'

{
  "formId": "<string>",
  "formTitle": "<string>",
  "fields": [
    {
      "key": "<string>",
      "label": "<string>",
      "dataType": "<string>",
      "required": true,
      "type": "<string>",
      "options": [
        {
          "label": "<string>",
          "value": "<string>"
        }
      ],
      "multiple": true
    }
  ]
}