curl --request POST \
  --url https://openplatform.gateapi.io/payClearing/clearing/previewMerchantFee \
  --header 'Content-Type: application/json' \
  --header 'X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>' \
  --header 'X-GatePay-Nonce: <x-gatepay-nonce>' \
  --header 'X-GatePay-Signature: <x-gatepay-signature>' \
  --header 'X-GatePay-Timestamp: <x-gatepay-timestamp>' \
  --data '
{
  "orderCurrency": "USDT",
  "accessMode": 0,
  "scenario": 0,
  "orderAmount": "100.00"
}
'