Affiliate Marketing Secrets

I’ve looked through some of the extensions that come up when I search for “affiliate”, but so far the pretty much all seem to be for displaying affiliate advertising. I’m not an expert, but am reasonably able in Joomla, and need to find a fairly simple extension for creating a one-level affiliate program.
I know I could probably do this with PHP, but that’s well above my grade at the moment (and I have no plan to reach that level of expertise). Ideally, I’d like an extension that works well with one of the simple store/shopping cart extensions, so I can easily track purchases through affiliate advertising.