Documentation for In App Purchase Structs

The documentation for implementing In App Purchases refers to “In App Purchase structs”:

…The function returns an array of In App Purchase structs, and each element…

Can someone point me to the full documentation for these structs? Specifically, I’m interested in exactly what receipt data is returned for both the Google Play and iTunes stores.

I’d like to know this too. The documented node above looks nothing like the node in 4.18. It’s a mystery what to do with it.