Adding an Item to Prestashop cart..

[Raven1923]

We are trying to accomplish the adding of an item to the prestashop cart and take the user to shopping cart summary page all from a sub-domain off the presta-shop site. For example:

on a site call there is a promotional page for our product adobe master collection (which in our case is Product id#159) There is an add to cart link on this page that we want to take the user, right to the shopping cart summary page in the main prestashop site(with the voucher coupon code entry option).

Currently any page address calls from these sub-domains end up on the home page.

Is there a solution where in the above functionality can be accomplished?? please advice asap..