有没有人有经验，使用网络资源退款。这是我的要求，但它只允许全额退款。
<?xml version="1.0" encoding="UTF-8"?>
<requestMessage xmlns="urn:schemas-cybersource-com:transaction-data-1.126">
<merchantID>brandbank_au_test</merchantID>
<merchantReferenceCode>437802</merchantReferenceCode>
<purchaseTotals>
<currency>AUD</currency>
<grandTotalAmount>69.12</grandTotalAmount>
</purchaseTotals>
<ccAuthReversalService run="false">
<authRequestID>2J580114GU137032F</authRequestID>
</ccAuthReversalService>
</requestMessage>