Your API key. For more information see here.
The site the API should be executed against, e.g. www.ditto.net.
The slug of the list to get the summary details for.
<List xmlns="http://www.ditto.net" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<DittoUrl>http://www.ditto.net/Lists/WorstMoviesIveSeen</DittoUrl>
<CreateDate>2008-02-11T11:58:51.14</CreateDate>
<Id>100</Id>
<OwnerPersonId>3726</OwnerPersonId>
<Slug>WorstMoviesIveSeen</Slug>
<Title>Worst movies ever made</Title>
</List>