How do I find an appURL

I can add an "Open App" action directly in the Shortcuts app, but I'd like to know what the actual appURL is that is triggered by the action. It is part of using a URL scheme to trigger actions in general.

For instance, I can create a clickable link in a Calendar event to open the Maps app if I use maps://, southwest//: for the Southwest Airlines app, or nfIx:// to open Netflix, etc. many of these are fairly obvious and are the app name, but some our abbreviations or something similar.

At any rate, is there a native process to determine an iOS app's appURL?