Place the PROD GoogleService-Info.plist here, named exactly:

    GoogleService-Info.plist

Register this iOS app first:
  • Firebase project: the PRODUCTION project
  • iOS bundle ID:    com.mybestie.mitra   (brand-new app — mitra has no legacy
                       App Store identity, unlike the customer app)
Then download its GoogleService-Info.plist into this folder (delete this .README).

Also paste its values into lib/firebase/firebase_options_prod.dart
(currently all PLACEHOLDER).

How it gets used: a build-phase "Run Script" (added in Xcode — Mac follow-up)
copies the per-flavor file into ios/Runner/GoogleService-Info.plist at build
time. See ../README.md and BUILD_FLAVORS.md.