How to generate promo codes and refund beta testers for Android apps
Getting playtesters for Android apps and giving out refunds for reviews of your Android apps is not nearly as straightforward as for iOS apps.
If you're a reviewer or beta tester for an iPhone or iPad app all you have to do is use a site like TestFlight or get the developer whose app is being tested to email you a promo code. Simple!
Perhaps that's why iOS apps are reviewed so much more often than Android apps. After all, a busy app review site can't afford the time nor money to review all the Android apps...