In-App Purchase Hack Protection from Freedom App

I did extensive search on various sites as well as StackOveflow but could not find any working solution.

I have already tried them without success,

In-app purchase protection from Freedom Hack

Protection from freedom

Please do not mark this question as a duplicate, as it is not. The solutions posted in the previous questions are outdated and out of date and do not solve my problem.

Problem

Simple and complex at the same time. My app has in-app purchases, and the Freedom app can bypass an in-app purchase with "FreeCard". What loophole is this app using and how can we solve it?

Any help would be really appreciated.

Bypass

I am not getting an answer to this question. I thought of a workaround where the app will check if the Freedom app is installed on the system, and if so, this will prevent the user from initiating a purchase without uninstalling the Freedom app.