arch-8.x-1.x-dev/modules/product/modules/downloadable/arch_downloadable_product.routing.yml

arch_downloadable_product.download:
  path: '/product/{product_id}/{file_uuid}/{user_uuid}'
  defaults:
    _controller: 'Drupal\arch_downloadable_product\Controller\ProductDownloadController::download'
  requirements:
    _custom_access: '\Drupal\arch_downloadable_product\Controller\ProductDownloadController::downloadAccess'

arch_downloadable_product.user.purchased_files:
  path: '/user/{user}/downloads'
  defaults:
    _controller: 'Drupal\arch_downloadable_product\Controller\PurchasedFiles::fileList'
  requirements:
    _custom_access: '\Drupal\arch_downloadable_product\Controller\PurchasedFiles::fileListAccess'
    user: \d+
  options:
    parameters:
      user:
        type: entity:user