G'day all - great forum - good to see.

I have a slightly unusual zen cart configuration - I have a website which is manually plugged into Zen Cart. That is to say that my website has nothing to do with Zen Cart until you go to purchase something, at which point, the Zen Cart shopping cart kicks in.

So a link to purchase something looks something like this:

onclick="opener.location.href='http://blah.com/catalog/index.php?main_page=index.php&products_id=10&action=buy_now&attr=1_11&back_url=s port.html'; self.close();">

My question is: is it necessary to include the product attributes in this link? Or is the products ID enough?

Thanks,

John