The Firebase Sender ID is required if you want to use Android Native Push Notifications in your Android app or Web Push Notifications in your website.

You'll find the Firebase Sender ID in Firebase Console when you navigate to your "Project settings" and then select the "Cloud Messaging" tab.

Your Firebase Sender ID will be on the right side as shown in the picture below:

You can find more details about the Firebase Cloud Messaging setup in this article.

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