curl -H "X-FH-APIKEY: $FINHAY_API_KEY" \
  "https://open-api.fhsc.com.vn/market/financial-data/silver"

{
  "error_code": "0",
  "message": "success",
  "data": [
    {
      "index": "SILVER_PNJ",
      "name": "Bạc PNJ",
      "short_name": "PNJ",
      "buy_value": 980000,
      "sell_value": 1050000,
      "usd_value": 28,
      "vnd_value": 1050000,
      "date": "2024-04-18",
      "provider": "PNJ",
      "provider_icon": null,
      "updated_at": "2024-04-18T10:00:00Z",
      "change_percent": 0.15,
      "buy_value_change_percent": 0.12,
      "sell_value_change_percent": 0.18
    }
  ]
}