curl --location --request POST 'https://sandbox-acq.onerway.com/v1/txn/onlineRefund' \
--header 'Content-Type: application/json' \
--data-raw '{
"merchantNo": "800515",
"merchantTxnId": "R-b20e9b40-4479-4ab7-aa40-69463f7dea45",
"originTransactionId": "1925113619105058816",
"refundAmount": "45",
"refundType": "0",
"sign": null
}'
{}