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The stored fcm_token is the Firebase Installation ID; HTTP v1 deprecates message.token (accepted only during the transition) in favour of message.fid. Push examples and push_fcm tests follow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B