I'm using a multisite instillation with subdomains. Say my checkout page is http://rootdomain.example/prosites. I want to be able to mimic this on all the subsites, so I also want the checkout to work on http://subdomain.rootdomain.example/prosites. How do I accomplish this? I have attempted redirects with htaccess, but this has been unsuccessful. Can I include the checkout page on each subsite?