block pages

Hello,

I am trying to download a wordpress eCommerce plugin but it needs to be private for non logged in users. I can make a page private but not the subpages that are made for the products. Is there a way I can block access for example…

https://try.jigoshop.com/?product=wild-at-heart-boat-neck-jersey

on all…

https://try.jigoshop.com/?product=

So when it comes up as ?product= no matter what is after it, it will be private.

Thanks for the help!