When it comes to sending remote notifications with Google Cloud Messaging (GCM), understanding the payload and downstream messaging is crucial. The payload is the data that is sent along with the notification, which may include information such as the title, message, and any additional data that is relevant to the notification.
Downstream messaging refers to the process of sending notifications from the server to the client app. In this case, the server sends a message to the GCM server, which then sends the message to the client app. This is a one-way communication, where the server sends
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