Tutorial: Guide to setup up Firebase Cloud Messaging for iOS and Android
iOSDevCamp Firebase Overview | PPT
CocoaPods could not find compatible versions for pod "Firebase/Core": In snapshot (Podfile.lock): Firebase/Core (= 6.22.0) · Issue #3471 · invertase/react-native-firebase · GitHub
Add push notifications to an iOS app
ios - How to create Pod framework with dependent Firebase - Stack Overflow