Originally Posted by zerovic

Yeah. It's pretty simple actually. It scrapes the Direct URL of the stats every 15 minutes, and checks if there are any changes or new values in the xml. If so, it saves the new sales in the db and sends me an email.

I will rewrite the whole thing in the upcoming days, as it's a mess right now, and post the entire source code if you are interested.

You only need a small database, a hosting account and you have to be able to set up cron jobs.