arch-8.x-1.x-dev/modules/checkout/arch_checkout.routing.yml

arch_checkout.checkout:
  path: '/checkout'
  defaults:
    _title: 'Checkout'
    _title_context: arch_checkout
    _controller: '\Drupal\arch_checkout\Controller\CheckoutController::checkout'
  requirements:
    _custom_access: '\Drupal\arch_checkout\Controller\CheckoutController::checkoutAccess'

arch_checkout.complete:
  path: '/checkout/complete/{order_id}'
  defaults:
    _controller: '\Drupal\arch_checkout\Controller\CheckoutController::complete'
    _title_callback: '\Drupal\arch_checkout\Controller\CheckoutController::completeTitle'
  options:
    parameters:
      order_id:
        type: 'arch_checkout_order_id'
  requirements:
    _permission: 'access content'
    order_id: '[a-zA-Z0-9_-]+'

arch_checkout.admin_settings:
  path: '/admin/store/settings/checkout'
  defaults:
    _title: 'Settings'
    _title_context: arch_checkout
    _form: '\Drupal\arch_checkout\Form\CheckoutSettingsForm'
  requirements:
    _permission: 'administer checkout settings'