When the quizaccess_campla plugin is installed, persons with the correct capabilities get shown a section "CAMPLA" in quiz settings.

There, a button "Generate CAMPLA configuration" opens a modal which talks to the CAMPLA endpoint and allows to send the quiz parameters there, to create an equivalent exam with the given values like title and course name as well as the full list of users.

Configuration

CAMPLA is an infrastructure service that institutions do self host.
It is then their duty to have the credentials and secrets set up and transferred to Moodle in order to get the correct configuration up and running to allow this quiz settings button to work properly.
A configuration document can be found here.
More information on how to set up CAMPLA can be found on campla.ch.