Family Sharing- Ask to buy question

I have set up Family Sharing for my family. My question/concern is that when one of the kids sends a request and I receive the request. If I am not using my phone the request shows as a banner and I can swipe the banner to address. However, if I am working in the phone and I receive the request, the notification goes away if I don't address it immediately. Where does the notification go after it disappears from my open screen so I can go in and approve or deny?