Pay per SEM performance

I'm sure there's a way to do this simply, but I don't know of any...

Scenario: my company has been approached to provide SEM services, where we are compensated for every loan application generated from a search engine query. Currently this company receives a substantial amount of its traffic from type-ins and obviously wouldn't want to give us credit for any of that.

What would work best? Some thoughts are optimizing for a subdomain, where all traffic to that subdomain would we counted...but if there's an easy way to use HTTP_REFERRER (or something else non-evasive) to not only determine where a click came from, but follow through to the completion of a loan app, that'd be preferrable.

Any ideas? I've been curious about how to do this for a while...and now I really have a reason to delve into it.

Cygnus

It can be done, it is quite simple. You can use query string
to pass the informations from one page to another.If you want to
avoid the info to be visible you can store the info using the Session
method and pass the information from one page to another.

Maybe is good idea the domain or subdomain to be owned by you?
Tommorow if something happen you can easily divert the traffic
to another company, so your effort will not be losed.

Send me a PM if you need any code snippet
Regards, Zoreli