commerce_promo_bar.routing.yml

entity.commerce_promo_bar.settings:
  path: 'admin/commerce/config/promo_bar'
  defaults:
    _form: '\Drupal\commerce_promo_bar\Form\PromoBarSettingsForm'
    _title: 'Promo Bar'
  requirements:
    _permission: 'administer commerce promo bar'