curl --request PATCH \
  --url https://geniusforms.ai/api/v1/forms/{id}/fields/reorder \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "fieldIds": [
    3,
    1,
    2,
    4
  ]
}
'

{
  "fields": [
    {
      "id": 123,
      "order": 123
    }
  ]
}