How to call my APP in IOS/Android from a link?

  

A user clicks on a link in his message software (whatsapp, telegram etc),
eg. www.somedomain123.com/listing/456
the user will have a chance to choose Browser (standard), or my App.
whatsapp web api once keyed into browser can call up the whatsapp App, so I know somehow this can be done.
If user chooses my App, my app will get the entire URL so that I know to
send him the listing with ID=456
How do I register my App in Delphi? Is it to do with associating all URL
in "domain123.com" to this App?
I have searched but only gotten examples to
opening a URL from an app, but I need the reverse of this.
Environment : Delphi 10.4 using Firemonkey for android, ios

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