[App] In app purchase or subscription to charge parents and students

[danlg]

https://alexdisler.com/2016/02/29/in-app-purchases-ionic-cordova/

https://github.com/AlexDisler/cordova-plugin-inapppurchase

https://github.com/cranberrygame/cordova-plugin-payment-iap

Security concern hacking risk especially with Android
https://developer.android.com/google/play/licensing/index.html

The Google Play Licensing service is primarily intended for paid applications that wish to verify that the current user did in fact pay for the application on Google Play.

Setting Up for Licensing
https://developer.android.com/google/play/licensing/setting-up.html

Setting Up the Licensing Verification Library

After downloading the LVL to your computer, you need to set it up in your development environment, either as an Android library project or by copying (or importing) the library sources directly into your existing application package.

https://developers.google.com/android-publisher/#subscriptions