Enter a URL for App Store server notifications

Hello fellow devs,

I'm looking to setup server-to-server notifications for application install (and onboarding completed). Basically, I need some kind of webhook such that when the application is installed by someone our server will get notified.

Based on Apple's docs (link below), it appears I can define it under the "App Information" section and field "URL for App Store Server Notifications" of App Store Connect, but I don't see it (wish I could attach screenshots).

https://help.apple.com/app-store-connect/#/dev0067a330b

Maybe it's because the app is in TestFlight? Is the link only available for apps that are published on the App Store?

Can someone please help? It's a real problem that I've spent days trying to figure out?

I'm also experiencing this issue. I do see a box for "URL for App Store Server Notifications" under App Information -> General Information, but when I try to add a URL there and save, I get an error

Enter a URL for App Store server notifications
 
 
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