in-app Apple subscription...can't find information about the "Share your information" feature

Now that Apple has changed their in-app subscription model, there is a feature that allows a user to share their information when they confirm their subscription. The message below is displayed after a user confirms their subscription purchase:

"Share your information" "The developer would like your name, email and zipcode so they can send you messages about related products in accordance with their privacy policy."

I have the Apple In-App purhcase programming Guide and I can't find anything about how this 'data' about the user is returned or retrieved by the deve开发者_运维技巧loper. Is it returned in the JSON string when verifying a receipt?

Apparently, this information is not passed or shared with the app via the API or any delegates. Apple collects this data themselves with the user and shares it via a backend admin. No programming is necessary to handle this feature.