This documentation is not using the current rendering mechanism and is probably outdated.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.
Events and event-registration - Payment¶
The Plugin “Events and event-registration - Payment” plugin should be placed on a separate TYPO3 page. You must reference the “Events and event-registration” plugin settings to the TYPO3 page UID if you want to use the payment plugin.