Custom certificate (plugin)

I think there needs to be a warning around the 'Email students' checkbox. Whenever the cron (https://docs.moodle.org/38/en/Cron) is run it checks if there are any certificates with 'Email students' marked. It then gets all the students that can access it and sends them an issue. You need to configure your restrictions correctly and before you check 'Email students' otherwise the certificate will be issued prematurely.