Joomla Module Customization to handle affiliate tracking

I need the Joomla 2.5 module REDJ customized to handle affiliate redirection and tracking. On a high level: 1) When an Affiliate referral arrives at my site, the URL has the affiliate key in the URL. If not, it it set the the sites default affiliate key. 2) We check if there is an affiliate cookie already. If not, we create one which stores: a) The referring affiliates ID b) The URL that they are trying to reach. c) We then redirect them to the Payment provider, who sets their cookie and refers them back to our site. d) When they are directed from the payment provider, then when they arrive back at the site, we seamlessly direct them to the page they were looking for. 3) If there is an Affiliate cookie already, and they are referred again by a different affiliate, we keep the original affiliate details in the cookie. The URLS stored need to be dynamic so that the same REDJ module can redirect for multiple domains. I also need a php cron script that can run every night that will load the REDJ tables with all of the unique affiliate URLS