Hi All,
I’ve made a very quick and dirty GDScript port of the Purchases Unity SDK to Godot Game Engine here: https://github.com/werdnahull/purchases-godot. Only Android works so far, but iOS is in the works.
As I said, it was done quick, so quite a few things are not done the “Godot” way, such as function names and variables. Callback functions were converted to signals, however.