curl --request PATCH \
  --url https://api.shoppex.io/dev/v1/products/{id}/variants/fields/{fieldId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Region Updated"
}
'

{
  "data": {
    "id": "field_1",
    "name": "Region Updated",
    "type": "select",
    "required": false,
    "placeholder": null,
    "default_value": null,
    "sort_order": 2,
    "options": [],
    "created_at": 1711953600,
    "updated_at": 1711953900
  }
}