Incurred ahead of calling onMessageReceived, including OS delays, app startup time, The time window for handling a message may be shorter than 20 seconds depending on delays Your service should handle any message within 20 seconds of receipt. Your service should override the onMessageReceived and onDeletedMessagesĬallbacks. To receive messages, use a service that extends Notification messages or data messages, you’ll need to write code to handleįor an explanation of the difference between notification and data messages, Firebase notifications behave differently depending on the foreground/background