Originally Posted by woj

For example, it might be useful if an affiliate program wants to start paying pay per signup and process the payments themselves. So the pay per signup webmasters might send traffic like this: http://www.site.com/?id=123&pay=pps
Then, when the script sees pay=pps, on the join page it sets ccbill_referer to a house account, and then the rest of the sale tracking process is done using a custom script.