I am trying to subscribe to an event in QB using pywin32. I found an documentation and tried their sample code: . 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>