Appstore's custom product pages

Hello,

I saw that now you can build multiple Appstore pages for you app using the new Custom Product Page. My question is: How can an app know from which product page was installed?

I would like to give users custom experiences based on the product page they installed the app from and I don't get it how could I know this information from an apps perspective.

Appstore's custom product pages
 
 
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