This is an extension to extend functions from https://extensions.typo3.org/extension/femanager Is such a simple extnsion that is good example or starting point to develop any other extension. It works as an alternative for this outdated example extension: https://github.com/einpraegsam/femanagerextended
This extension just adds a new varchar field to the default femanager field options. A personal_number attribute to the fe_users table It has been tested using typo3 10.4