add verification code to mobile game

I’ve created a mobile game for android platform. I want to limit the apps user to 3 user per purchase using verification code. How to make the apps ask for code after splash screen?

You’re going to have to do some advanced scripting: https://docs.unity3d.com/Manual/AndroidMobileAdvanced.html

You will want to prohit yourself from going outside of the android API and use their device limits and a license server to track enablement: Adding Server-Side License Verification to Your App  |  Android Developers

If you customize this entire process you’re going to confuse users as it applies to the rules of applications in the store that customers are accustom to.

Just my 2 cents.