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At first you need NativeLib-CLI or NativeLib Addon.
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Make
nativelib -i appsflyerin your project directory if you are using CLI. FindAPPSFLYERin plugins list and press "Install" button if you are using GUI Addon. - 
Add
AppsFlyer/DevKeyin your Project Settings. - 
Enable Custom Build for using in Android.
 
Add wrapper scripts/appsflyer.gd into autoloading list in your project. So you can use it everywhere in your code.
You should not use it directly. It will be called automatically when your application starts.
You can get appsflyer user ID with this method.
The main method for sending analytics events. All other public methods are shortcuts for specific event and uses event internaly.
Event when user opens specific screen.
Event when user registered or logged into your app.