If "Global" Affiliate Mode is selected 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 it can't find the affiliate cookie, Zaxaa will search customer purchase history. The last affiliate that refers this customer 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.