curl --request POST \
  --url https://sandbox.finhub.cloud/api/v2.1/fincard/virtual/card/balance \
  --header 'Content-Type: application/json' \
  --header 'X-Forwarded-From: <x-forwarded-from>' \
  --data '
{
  "cardId": "<string>"
}
'

{
  "success": true,
  "code": 200,
  "msg": "Success",
  "data": {
    "cardId": "<string>",
    "availableBalance": 123,
    "usedAmount": 123,
    "currency": "<string>"
  }
}