Sean Hollister, reporting for The Verge:

The details of how, when, and where Google would charge its fees are complicated, and they seem to be somewhat tailored to the needs of a game developer like Epic Games. Google can charge 20 percent for an in-app purchase that provides “more than a de minimis gameplay advantage,” for example, or 9 percent if the purchase does not. And while 9 percent sounds like it’s also the cap for apps and in-app subscriptions sold through Google Play, period, the proposal notes that that amount doesn’t include Google’s cut for Play Billing if you buy it through that payment system.

That cut will be 5 percent, Google spokesperson Dan Jackson tells The Verge, confirming that “This new proposed model introduces a new, lower fee structure for developers in the US and separates the service fee from fees for using Google Play Billing.” (For reference, Google currently charges 15 percent for subscriptions, 15 percent of the first $1M of developer revenue each year and 30 percent after that, though it also cuts special deals with some big developers.)

If you use an alternative payment system, Google might still get a cut: “the Google Play store is free to assess service fees on transactions, including when developers elect to use alternative billing mechanisms,” the proposal reads. But it sounds like that may not happen in practice: “If the user chooses to pay through an alternative billing system, the developer pays no billing fee to Google,” Jackson tells The Verge.

According to the document, Google would theoretically even be able to get its cut when you click out to an app developer’s website and pay for the app there, as long as it happens within 24 hours.

This seems as clear as mud, other than being music to Epic Games’s ears.