This is Google Sign In Tutorial for iOS firebase. (Oauth 2.0)
Youtube https://www.youtube.com/watch?v=NubKNnuMFio
Stack Overflow https://stackoverflow.com/questions/74045260/no-active-configuration-make-sure-gidclientid-is-set-in-info-plist
Tistory https://huisoo.tistory.com/4