This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
From < 2.0.0¶
Everything has changed. 90% of the code is gone and was replaced by new functions and a class system. We have changed the templates quite a bit to support product variants. There is also a huge change within the tax classes (setup). We recommend checking your TypoScript settings and your HTML templates on a test system before installing this update on a productive server.