[Home](./index.md) > [@firebase/messaging](./messaging.md) ## messaging package ## Functions | Function | Description | | --- | --- | | [deleteToken(messaging)](./messaging.deletetoken.md) | Deletes the registration token associated with this messaging instance and unsubscribes the messaging instance from the push subscription. | | [getMessaging(app)](./messaging.getmessaging.md) | Retrieves a firebase messaging instance. | | [getToken(messaging, options)](./messaging.gettoken.md) | Subscribes the messaging instance to push notifications. Returns an FCM registration token that can be used to send push messages to that messaging instance.If a notification permission isn't already granted, this method asks the user for permission. The returned promise rejects if the user does not allow the app to show notifications. | | [onMessage(messaging, nextOrObserver)](./messaging.onmessage.md) | When a push message is received and the user is currently on a page for your origin, the message is passed to the page and an onMessage() event is dispatched with the payload of the push message. | ## Interfaces | Interface | Description | | --- | --- | | [FcmOptions](./messaging.fcmoptions.md) | | | [FirebaseMessaging](./messaging.firebasemessaging.md) | | | [MessagePayload](./messaging.messagepayload.md) | | | [NotificationPayload](./messaging.notificationpayload.md) | Currently supported fcm notification display parameters. Note that [https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/notifications/NotificationOptions](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/notifications/NotificationOptions) defines a full list of display notification parameters. This interface we only include what the SEND API support for clarity. |