Affiliate Pro 1.7.1
Sales Page: http://codecanyon.net/item/affiliate-pro-affiliate-management-system/12908496
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"Affiliate Pro - Boost Website Sales by Having Affiliates Sell your Products!
Affiliate Pro is a Powerful and yet simple to use PHP affiliate Management System for your new or existing website. Let affiliates sell your products and reward them with a commission. More importantly, use Affiliate Pro to track it intelligently to keep your affiliates happy and also your bottom line!
So how does it work? It is pretty simple, when a user visits your website through an affiliate URL (for example http://mydomain.com?ref=1234) the responsible affiliate sending (or referring) the traffic to you will receive a commission of any sales generated...!"