curl --request POST \
  --url https://uat-api.clinkbill.com/api/refund \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --header 'X-Timestamp: <api-key>' \
  --data '
{
  "orderId": "ord_xxxxx",
  "refundMerchantOrderId": "refund_ref_10001",
  "refundAmount": 19.99,
  "refundReasonType": 2,
  "remark": "Customer requested refund"
}
'

{
  "code": 200,
  "msg": "success",
  "data": {
    "createTime": 1754819711382,
    "refundId": "rfd_abc123xyz",
    "orderId": "order_def456uvw",
    "customerId": "cus_ghi789rst",
    "refundAmount": 19.99,
    "refundCurrency": "USD",
    "status": "success",
    "refundReason": "Customer Initiated Refund",
    "metadata": {
      "arn": "8377252556170253",
      "merchantReferenceId": "sample_id"
    },
    "paymentInstrumentId": "<string>"
  }
}