Are we allowed access to a purchase's reporting ID and developer payload?

Hi! I am trying to get unique identifiers when initiating purchases for our application.
The v49 Platform SDK documentation for purchases mentions retrieving a Reporting ID and developer payload, but I get nothing or zero when I try to retrieve these values from IAP.GetViewerPurchases().

Am I missing something? Do I need to make a specific request in the app's Data Usage Checkup? Are developers outside Meta even allowed access to this function?