How to see the log in shipping build?

I’m trying to test on android market with shipping build.

First, I tried to register app with development setting, but it failed because the app built with debug info was rejected.

I’m testing in-app purchase. It just shows a message " failed".

I was going to use adb logcat -s UE4, but as you know, in shipping build there is no log.

What should I do to see a log?

I did this with comment a pre-definition line of AndroidMisc.cpp for shpping build.

void FAndroidMisc::LocalPrint(const TCHAR *Message)
// Builds for distribution should not have logging in them:
// Prepare your app for release  |  Android Studio  |  Android Developers