I'm tearing my hair out here :/
Created a test based on the checklist here, and tried both Android and Apple. It's taken me days of experimenting and reading. Managed to get a purchase to happen, but the product purchased check does not work, which makes it unusable.
I'm stuck telling my client I cannot do in-app purchases, which is really embarrassing.
Is there anything I can do to work around the problem? Via plug-in?
Ashley, what is the status with this? - it's clearly an important issue for many of us (the number of views on this thread are huge :).