Validating app receipts native plugin, looking for experience coder

Hi,

i'm looking for someone who has some experience with writing native plugins who could take a look at my problem.

I have a paid game that is released for quite some time. Now i want to switch to free with one iAp to unlock the game. For any user that has bought the game as a paid version and is redownloading the free one, the game should instantly unlock for them. This is why i need to check which version they originally purchased/downloaded.

I'm a very novice programmer but i found...

Validating app receipts native plugin, looking for experience coder