Developed by devhub.io
Lightweight In App Purchases Swift framework for iOS 8.0+, tvOS 9.0+ and macOS 10.10+
Swift In-App Purchase Manager for iOS
A simple PHP framework for very small sites
Fast and easy checkout library (Android In-App Billing) for Android apps with RxJava support.
A demo of In-App Purchase
Just a side project I'm working on named TapMove
Python In-app purchase validator for Apple AppStore and GooglePlay.
In App Purchase Receipt Validator for iTunes and GooglePlay