access_code.routing.yml

access_code.login:
  path: '/user/ac'
  defaults:
    _form: '\Drupal\access_code\Form\LoginForm'
    _title: 'Use access code'
  requirements:
    _user_is_logged_in: 'FALSE'

access_code.auto_login:
  path: '/ac/{access_code}'
  defaults:
    _controller: '\Drupal\access_code\Controller\UseCodeController::useCode'
    _title: 'Access code login'
  requirements:
    _user_is_logged_in: 'FALSE'

access_code.settings:
  path: '/admin/config/people/access_code'
  defaults:
    _form: '\Drupal\access_code\Form\SettingsForm'
    _title: 'Access code settings'
  requirements:
    _permission: 'administer account settings'