curl --location --request POST 'https://sandbox-acq.onerway.com/v1/txn/onlineRefund' \
--header 'Content-Type: application/json' \
--data-raw '{
"merchantNo": "800515",
"merchantTxnId": "R-b7f66996-36d2-41fa-adca-ce19545a0e72",
"originTransactionId": "{{TRANSACTION-TO-REFUND}}",
"refundAmount": "{{REFUND-AMOUNT}}",
"refundType": "1",
"sign": null
}'
{}