Notifications on Flutter from a Django Server - flutter

I am developing a Flutter Application with Django Backend.
Our app has a feature to send notifications to user, which will be sent from the server.
I understood we need to build a stream for this.
But do we need external services to build our stream like getstream.io?
Or we can build our own stream using Django?

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I'm not convinced you've searched... Here is where sending notifications via REST is mentioned in the Sending Push Notifications tutorial: https://mobilefirstplatform.ibmcloud.com/tutorials/en/foundation/8.0/notifications/sending-push-notifications/#rest-apis
You did not specify if your application requires authentication or not, so it is best that you will review the entire Notifications category of tutorials.