curl --request POST \
  --url https://api.example.com/v1/pay/address/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": "483902480932841787",
  "prepayId": "1665553233227833",
  "refundAmount": "20",
  "refundReason": "test refund function",
  "receiverId": 598816
}
'

{
  "refundRequestId": "483902480932841787",
  "prepayId": "1665553233227833",
  "orderAmount": "14.9",
  "refundAmount": "4.9"
}