Running `pod install Firebase/Messaging` results in `[!] Unknown command: 'Firebase/Messaging'` using Cocoapods v1.3.1.
Also, there was a parse error in `HEADER_SEARCH_PATHS = "$(SRCROOT)/../node_modules/react-native/Libraries/PushNotificationIOS/**""$(SRCROOT)/../node_modules/react-native-fcm/ios";`, I was able to fix it by opening `APPNAME.xcodeproj/project.pbxproj`.