Note – If Unreal Engine already had an older billing line hidden (such as implementation ‘com.android.billingclient:billing:4.0.0’), either delete that old line or put // in front of it to comment it out.
7. Save this file
8. Delete your project’s Intermediate, Saved and Binaries folders.
9. Open the project, change Store version in the Project settings and repackage the app.