android - Protecting In-App Purchase Hack from Freedom App -

i have made extensive search on various websites stackoveflow couldn't find working solution.

i have tried these without success,

protecting in-app purchases freedom hack

protection freedom

please not mark question duplicate, not. solutions posted in previous questions old , outdated , doesn't solve problem.

the problem

its simple , complicated @ same time. app has in-app purchases , freedom app can bypass in-app purchase "freecard". loophole app exploiting , how can solve this?

any appreciated.

workaround

i not getting answer question. have thought of workaround app check if freedom app installed in system, , if so, not let user initiate purchase without uninstalling freedom app.