react-native-firebase/docs/iid/ios.md

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iOS Setup	Manually integrate Instance ID into your iOS application.

iOS Manual Linking

The following steps are only required if your environment does not have access to React Native auto-linking.

CocoaPods Installation

Add the RNFBIid Pod

Add the RNFBIid Pod to your projects /ios/Podfile:

target 'app' do
  ...
  pod 'RNFBIid', :path => '../node_modules/@react-native-firebase/iid'
end

Update Pods & rebuild the project

You may need to update your local Pods in order for the RNFBIid Pod to be installed in your project:

$ cd /ios/
$ pod install --repo-update

Once the Pods have installed locally, rebuild your iOS project:

npx react-native run-ios