Android :: Store Whether User Account Is Pro In Secure Way

I am developing an Android frontend to a web application using its API. This Android application will expose some extra features if the user is a 'pro'. Therefore I need the Android app to acquire the information whether an account is pro. That is done while getting the token. In other words, when the Android application requests a token to the web application via the API, the web application provides also a flag representing whether the user is a pro.

When the Android app gets that piece of information, it stores it in the SharedPreferences, like this: this.sharedPreferencesEditor.putBoolean(Account.PRO_ACCOUNT, isPro).commit();

Then the Android app reads that value to decide whether a certain feature is available to that user. Now, my question is: is that approach easily hackable? I mean, can some clever user work-around this system and get pro-features even if they are not pro-users? How could do that?