This documentation is not using the current rendering mechanism and is probably outdated.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 < 3.0.0¶
When upgrading to wt_cart 3.x you don't need to worry. There are no breaking changes and the upgrade from 2.x to 3.x should run smoothly. The new major version was released to make wt_cart compatible with TYPO3 CMS 6.2 and powermail 2.1.x (with support of 2.0.x and 1.6.x as well).
With wt_cart 3.0.0 it is also possible to change the confirmation page. There is now a new subpart ###WTCART_CONFIRMATION### in the HTML templates which allows you to display the cart with all calculated information again. But you can also completely change the output and display whatever you like.