What is Firebase instance ID?

Firebase Instance ID provides a unique identifier for each app instance and a mechanism to authenticate and authorize actions (example: sending FCM messages). Instance ID is stable except when: App deletes Instance ID. App is restored on a new device. User uninstalls/reinstall the app.

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How do I send a FCM push?

For sending FCM notification payload you can use Firebase Cloud Messaging Tool in firebase console . And click on Send your first message. Then enter the Title and body field. If you wish to send it to a particular device then click on Send test message and enter the FCM registration token.18 Tem 2020

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