You can provide your users with a url that automatically logs them in. To set this up, you need a pair of username => password in the
urlKeys configuration setting.
<?php return [ 'urlKeys' => [ 'steeve' => 'BepmD8GQBZpaFpXQ', ], ];
After setting that up, you can login by going to
http://my-site.test/autologin?key=BepmD8GQBZpaFpXQ. This will login the user
If you want to redirect to the control panel dashboard, add
cp=true to the url: