It is easy to use the Mobile Master IAP plugin, you will only need to follow the steps below.

1. The first step is to add the Mobile Master IAP object into the project.

2. If the application is for Android, create a manifest.json or import the prepared one in the plugin documentation.

The manifest.json should contain the key "play_store_key", then set the value "<your_public_key>", fill in your own app public key.

Skip this step for iOS projects.

As of now, there is no way to make this easier in this plugin. However, there is now the new and better Mobile Billing plugin that no longer requires this step.

3. The Mobile Master IAP also requires you to fully configure your Google Developer Console to properly work. This includes the store listing, default pricing, localized pricing, etc. The project also needs to be in its released state, even if just on the beta release phase. Otherwise, any attempts to purchase or subscribe to any product in your application will launch an error.

4. To test purchases, it is important to add your account to your application's testing group. Your Google Account that has the Google Developer Console in which the project is owned, is automatically a tester account. 5. If the purchase or subscribe dialog popup shows the product is not available for this user or application, then please check if your in-application products are available to your current country location set in your Google Account. And, if the local price for that country is set in your Google Developer Console. Additionally, check if instruction #4 above is also properly set.

6. Lastly, from the plugin properties. If the Debug Mode property is enabled, the plugin will log errors in the debug console.

The debugging logs are available in different debug consoles, including the Android Studio, Xcode, Chrome Developer Tools - Console and Safari's Web Inspector.