Wildcart SSL Cert and Domain Mapping

I've been reading a ton on this subject in your forums and elsewhere and I'm having a hard time finding a definitive answer. I'm hoping you can help and I hope my question makes sense.

I want to offer my WordPress Multisite clients access to WooCommerce. Client sites are hosted on WPMU with each site on a subdomain. When a user checks out, I want them to use a wildcart SSL cert. To do so, visitors would have to be automatically redirected to the subdomain (not their mapped domain) for pages requiring SSL.

Is this possible? Is there documentation on how to do this somewhere?