I hope this is where I should ask about this ... if not, my apologies.
We have several sites three of which have shopping carts (all different). Because of the time factor in updating and changing the carts, we are considering setting up just one cart where we can combine the products in different categories. This cart would be on a separate domain (say) mydomainsupport.com
We intend this site to be a 'flagship' site in the company name, where we will include a full support suite as well as the combined shopping cart. The shopping cart is also our (combined) product catalog.
To access the shopping cart, we would use links to the support site. Whilst it will be obvious the visitor is being taken to another site for the shopping experience, we will make a feature of this on the landing page, stressing improved services and security.
There will also be back links from the shopping cart to the content sites.
To us, this would appear to have several benefits in maintenance and control. It would allow us at any time to make changes to the main content sites without affecting the support site. We believe it will also increase sales.
What we are unsure about is how this would be perceived in SEO terms as well as from a visitor perspective.
We would be grateful for any advice or feedback from the learned members of the WPW community.