How to modify AndroidManifest.xml properly to fix android:exported parameter problem?

I want to publish my app on test mode. Howeber, when I upload my .aab file to google I receive an error something like project do not have android:exported=“true/false” setting. I checked my Manifest file and seen some tags already have it but some do not. Finally, I managed engine source code in UEDeployAndroid.cs to put to all activity, service, provider as I heard all these tags need it. There is no code for com.android.billingclient.api.ProxyBillingActivity inside UEDeployAndroid.cs file I think that activity node generated from somewhere else.

   <activity
            android:name="com.android.billingclient.api.ProxyBillingActivity"
            android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:theme="@android:style/Theme.Translucent.NoTitleBar" />

Looks like some tags are generated from somewhere else. I want to find out how com.android.billingclient.api.ProxyBillingActivity node generated by engine code and put here android:exported=“…” node. Any help?