There are no lock screen notifications
Peelpel does not send notifications to your phone's lock screen or to your operating system. Notifications exist inside the product only.
That means that to learn something has happened, you open the app or the website and look at the bell or at the notifications screen.
Nothing is lost because of this. The notification is written either way, and it waits until you come in.
The booking itself does not depend on a notification: it closes even if neither side has opened the app. The bell reports; it does not decide.