What we have:
A medium size web store with about 6000 items (not pages).
What we need:
An automated XML sitemap for Google Webmaster Tools.
What we like to have:
A way that an XML sitemap is created and updated each time we add or change content. That is every day. Special pages that are related to the shopping cart and check out process should be excluded.
There is no FTP access to the domain but a subdomain is possible if needed.