curl --request POST \
  --url https://openplatform.gateapi.io/v1/pay/checkout/refund \
  --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 '
{
  "refundRequestId": "100036668891329",
  "prepayId": "93752669101887488",
  "refundOrderCurrency": "USDT",
  "refundOrderAmount": "100",
  "refundPayCurrency": "USDT",
  "refundPayAmount": "50",
  "refundReason": "test refund",
  "receiverId": 6790011
}
'

{
  "status": "SUCCESS",
  "code": "00000",
  "errorMessage": "",
  "data": {
    "refundRequestId": "32111114322523534534",
    "prepayId": "50620368071692288",
    "orderCurrency": "BTC",
    "orderAmount": "2",
    "refundOrderAmount": "1",
    "payCurrency": "BTC",
    "payAmount": "2",
    "refundPayAmount": "0"
  }
}