curl --request POST \
  --url http://dev-cn.your-api-server.com/card/balance \
  --header 'Content-Type: application/json' \
  --data '
{
  "merchantId": "<string>",
  "merchantUserId": "<string>",
  "powerCardId": "<string>",
  "channel": "<string>"
}
'

{
  "success": false,
  "errorCode": "",
  "errorMessage": "",
  "errorMessageEn": "",
  "detailMessage": "",
  "requestId": "",
  "data": {
    "balance": 0,
    "currency": ""
  }
}