Oops.. it looks like something may have been missed. Can you add the following to the application node of AndroidManifest.template.xml: <meta-data android:name="com.google.android.play.billingclient.version" android:value="4.0.0" /> ..and try again? If this fixes it, I'll file a report in the Quality Portal, unless you want to 🙂   If it doesn't fix it, you might like to use this tool: https://github.com/skylot/jadx to look inside classes.dex in the project output folder, and make sure com.android.billingclient is in there. Perhaps do this first