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