$ npm install react-native-referrer --save

$ react-native link react-native-referrer

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.jdc.reactlibrary.RNReferrerPackage; to the imports at the top of the file
• Add new RNReferrerPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-referrer'
   project(':react-native-referrer').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-referrer/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

   compile project(':react-native-referrer')
   

4. Insert the following lines inside the application block in android/app/src/main/AndroidManifest.xml:

   <receiver android:name="com.jdc.reactlibrary.ReferrerReceiver" android:exported="true">
     <intent-filter>
       <action android:name="com.android.vending.INSTALL_REFERRER" />
     </intent-filter>
   </receiver>

import RNReferrer from 'react-native-referrer';

...
const referer = await RNReferrer.getReferrer();