[Python] How to subscribe to an event with qbxml in Quickbooks Desktop using its SDK?

I am trying to subscribe to an event in QB using pywin32. I found an documentation and tried their sample code: https://developer.intuit.com/app/de...-to-events-and-processing-event-notifications. But it returned an error:

QuickBooks found an error when parsing the provided XML text stream.
​

<?xml version="1.0" ?>
<?qbxml version="6.0"?>
<QBXML>
<QBXMLMsgsRq onError = "stopOnError">
<DataExtModRq requestID = "0">
<DataExtMod>
<OwnerID>0</OwnerID>
<DataExtName>Category</DataExtName>
<ListDataExtType>Customer</ListDataExtType>
<ListObjRef>
<FullName>John Sidmark</FullName>
</ListObjRef>
<DataExtValue>Gold Member</DataExtValue>
</DataExtMod>
</DataExtModRq>
</QBXMLMsgsRq>
</QBXML>

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