[Question] Is it safe to use default redirectUrl "localhost:4000" for the app store release?

[BradKwon]

Hello,

I am investigating on this package to use it for the SSO in the Flutter app.
I see that the default redirectUrl for the authorizationCodeWithPKCE is "localhost:3000".

I was wondering if it is safe to use this default url for the app store releases both Apple App Store for iOS and Google Play Store for Android.
My concern is security and having app store review rejections.

It would be a great help for me, if someone, who already released any Flutter apps with this package to both app stores without any rejections or issues.

Thanks in advance.