If the product seller selects "Global" Affiliate Mode on Affiliate Settings page, Zaxaa's mechanism to perform the Lifetime Affiliate Commissions tracking is via cookies and customer purchase history in the database.
When customer purchases, Zaxaa first checks the browser cookie.
If there is NO affiliate cookie in the browser, Zaxaa will search customer purchase history. The last affiliate that refers this customer (from previous transactions) will get credited in this transaction. Hence it is not possible to by pass this affiliate mechanism, EVEN if the customer clears his cache or cookies.
If there IS affiliate cookie in the browser (e.g. John's affiliate cookie), John will get credited. If customer purchase history (from previous transactions) indicates that there already is another affiliate (e.g. Peter), John will replace Peter as the referring affiliate.