CP Commerce
Configuration screens inside the CP Commerce admin console, documented one screen at a time. The applet itself is covered on the CP Commerce Admin page; these are the individual settings areas.
How push notifications reach the Customer Portal mobile app: the Firebase service-account credential stored on the Website record, the Website settings that decide who is subscribed, the Notification and Scheduled screens in CP Commerce Admin, the app-side registration flow, and the failure messages the backend returns.
The shopper-facing e-invoice path in Cross Platform Commerce: the e-invoice widget a Customer Portal website can carry, how a buyer finds their receipt and supplies a TIN and identification number, what a guest can and cannot do, the queue processor that turns the request into an individual LHDN e-invoice, and the one hostname setting the whole path depends on.