The Show List app is an app for publishing Favorite List in frontend to anonymous users. Registered users manage and view their favorite list via the Customer Experience Center - Favorites app.
Overall, the app is very simple – it consists of a template for rendering a favorite list to anonymous users. The context is set by adding a PublishID parameter to the query string when linking people to the page, e.g. /ecommerce/show-list-app?PublishedID=Q1wFhUp5iN – the PublishID value is autogenerated when a favorite list is created and is available from the favorite list templates in the customer center.