402853 online shop prestashop/oscomme

we require a modified installation of prestashop OR oscommerce. we are open to suggestions about other carts (such as zencart or otherwise) we want to allow multiple shops to set up their OWN shops on the same database. so for example, shops a, b, and c would all be on [login to view URL] [login to view URL] ; [login to view URL] ; [login to view URL] if a user visits the main shop, they will view ALL the products available from all shops a, b, c all shops can log into [login to view URL] ; however shop-a CANNOT view shop-b's products ; categories ; orders ; customers or other settings they may only view THEIR OWN settings however WE MAY log in as a super administrator and view ALL products, categories, shops shop-a, may not view / modify shop-b's settings, administrators or employees ALL payments MUST go to our email address and NOT Shop-a, b or c we also require to enable the shops to include facebook and twitter so that they can have friends we would also ask to see some experience or previous related projects