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With Firebase Cloud Messaging, you can choose between two types of messages:

• The Data message is handled by the client app. These messages are sent directly to the mobile application, which generates and displays an Android notification on the device. Data messages contain only your custom application variables.

  To define the content, personalize data, and add dynamic content, click on the Message field and use the Expression editor. You can access this editor to customize your messages.
  In the Application variables menu, your Application variables are automatically added. These variables allow you to define notification behavior. For example, you can configure a specific application screen to be displayed when the user activates the notification.

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• The Notification message, handled automatically by the FCM SDK. FCM automatically displays the message on your users’ devices on behalf of the client app. Notification messages contain a predefined set of parameters and options but can still be further personalized with custom application variables.

  To compose your message, click the Title and Message fields. Use the Expression editor to define content, personalize data and add dynamic content.

  To further personalize your push notification, you can choose an image to add to your push notification, the notification’s icon to display on your profiles’ devices and its color.

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To compose your message, click the Title and Message fields. Use the Expression editor to define content, personalize data and add dynamic content.

You can add a Subtitle, value of the subtitle parameter of the iOS notification payload. Refer to the this section.

The Silent Push mode allows a “silent” notification to be sent to a mobile application. The user is not made aware of the notification’s arrival. It is transferred directly to the application.

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