Let's zoom in on the types of actions we can see from the screen capture.
As you can see, this user set up a sale action, a lead action, other actions, plus deleted a purchase/sale action. You can also set up a bid (which looks to be the amount you pay when the desired action is completed) and then you have the standard stats.
Google obviously provides tracking code that you must install on your site, and it seems like Google will verify if the code is properly installed - so that publishers will get paid.
I still hope to gain access to both betas (AdSense PPA and AdWords PPA) soon and have more details for you then.
Our past coverage on Google Pay Per Action:
Forum discussion at Search Engine Watch Forums.