Update references.md

activitree · Oct 27, 2019 · 2f47457 · 2f47457
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+Firebase Admin SDK in use: https://firebase.google.com/docs/reference/admin/node/admin.messaging
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+The Firebase API in user: https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages
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 Firebase Errors: https://firebase.google.com/docs/reference/fcm/rest/v1/ErrorCode