Use User-Defined build settings in custom .plist file

Question

I have different build configurations (Debug, Stage, Prod) defined for my app and I use User-Defined build settings:

to set up Facebook log

Answer 1

I put two files with the (same) name GoogleService-Info.plist into my project.

One is at the root and one is in a folder called 'staging', so as to avoid a naming conflict in the file system.

Including one in one target and the other in another makes it so that each target has a unique plist file with the correct name.