This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
There is an own channel at the TYPO3 Slack. Please use this cannel to contact us.
The URL is: https://typo3.slack.com/messages/ext-cart/
Not registered on Slack? You can join here: http://forger.typo3.org/slack.
If you need further support, please contact me.
Be aware that this support might not be free!