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Use the StartAppBackPlugin in components where you would like the user to press 'back' to exit the application. The plugin will show an ad and then exit the application.
1. Drag the StartAppBackPlugin.cs to the components which you would like pressing 'back' to exit the application
2. Do not implement exit on the 'back' in this components
NOTE: there is no need to implement exit on the 'back' button in these components as the plugin will exit the application after showing the ad.