curl --request GET \
  --url https://api.contazen.ro/v1/vat-rates \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": [
    {
      "id": "<string>",
      "percent": 19,
      "description": "19% - TVA",
      "is_used": true,
      "can_be_deleted": true,
      "is_custom": true
    }
  ],
  "total": 123,
  "available": [
    {
      "key": 123,
      "percent": 123,
      "description": "<string>",
      "ubl_category": "<string>",
      "reason": "<string>"
    }
  ],
  "default_percent": 123
}