curl --request PUT \
  --url https://api.prod.getdex.com/v1/custom-fields/reorder \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "updates": [
    {
      "customFieldId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "ranking": 123
    }
  ]
}
'

{
  "error": true,
  "data": {
    "custom_fields": [
      {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "name": "<string>",
        "field_type": "<string>",
        "categories": [
          {
            "category": "<string>"
          }
        ],
        "ranking": 123,
        "created_at": "<string>",
        "updated_at": "<string>"
      }
    ]
  }
}