Add an Affiliate program to a osCommerce site

Like to integrate an stable affiliate program into an existing oscommerce site.? Coder must have extensive experience in related work, please provide sample/reference site.? If you are using third party script/product, that is OK, I just need you to take care of all the installation and integration.? ## Deliverables Keep changes to the already customized osCommerce site to the minimum, I just need a link to the entry point of the affiliate program pages, and will do customization myself to match my existing site.