You will be notified of the sale through the marketplace where the item has sold, the same way you would after having listed the item directly on that marketplace. Zipsale also has an automatic de-listing feature for some marketplaces for subscribers; you can also delist the sold items manually from all the other marketplaces with just a couple of clicks. The transaction itself and your communication with the buyer will take place on your marketplace account and not on Zipsale.