After you process GetListOfEvents:
Just push XML like this to the RemoveFromListOfEvents method at:
http://opendoxx.com/incoming/testproc.php
<RemoveEvents>
<VendorUserName>YOURAPPLICATIONID</VendorUserName>
<VendorPassword>YOURAPPLICATIONPASSWORD</VendorPassword>
<Events>
<EventToken>29O3V7WYX4GDLHUSN8KT</EventToken>
<EventToken>NJOCDTZ8FXAHE19VIW6R</EventToken>
</Events>
</RemoveEvents>
OpenDoxx will then respond with what happened:
<?xml version="1.0"?>
<RemoveEvents>
<Event>
<EventToken>29O3V7WYX4GDLHUSN8KT</EventToken>
<Status>Event Removed From List</Status>
</Event>
<Event>
<EventToken>NJOCDTZ8FXAHE19VIW6R</EventToken>
<Status>Event Removed From List</Status>
</Event>
</RemoveEvents>