It’s very simple: a personal identification is integrated in every advert that you place, for example, in a banner. Every customer that clicks on the banner, automatically saves the ID of this advert on his computer. Now when he visits our website, we register this ID and know from which websites he has been redirected from. This ID will be saved for 30 days by setting a cookie on the customer’s computer. Please note that purchases can only be registered properly, if the cookie-setting is activated on the purchaser’s computer.