Hello,
I make a game and release it only in France for yet. Global launch is for August 20th.
Then I found a website that create a mod with free purchase in it. What’s the hell. I have implemented receipt. What to do more to avoid piracy like this?
Best,
Thibaut
Piracy website like this : https://www.maxmodapk.com/ how to protect our apk to do not appears on it?
The safest way is to validate the receipt on the server-side, Unity IAP also currently provides the ability to validate receipt locally.
In addition, you can obfuscate the code to make the App more difficult to crack.
thank you @SamOYUnity3D : I have implement valid receipt locally. Then I think yes it is better to do it server side but more difficult.
I will look at obfuscate my code with proguard but the hell is done. My game is on this hacker website before I release it globally. 
That isn’t good. Good thing most users won’t discover the hacked version. Unfortunately this is not uncommon on Android.