# How Can I Set The Time-To-Live (TTL) For a Push Notification?

The process to add a TTL to a push notification depends on the target platform. You can see a guide for each platform below. 

#### APNS (iOS)

The \`expiration\` value can be set at part of the APNS payload as below. The value should be an EPOCH timestamp in the future. 

```
{
  "apns": {
    "expiration": 1640995200,
    "aps": {
      "alert": {
        "body": "Hello World!"
      }
    }
  }
}
```

#### FCM (Android)

The \`time\_to\_live\` value can be set to the number of seconds FCM should hold the notification if the device is unreachable. The maximum and default value is 4 weeks. Read more about this in the [Firebase documentation](https://firebase.google.com/docs/cloud-messaging/concept-options#ttl)

```
  "fcm": {
    "time_to_live": 10000, # Number of seconds
    "notification": {
      "body": "Hello World!"
    }
  }
```

#### Web Push

See our [documentation](https://pusher.com/docs/beams/reference/publish-payloads#web-format.) guide for an example of how to configure this for Web. 

{% hint style="info" %}
Still have questions? Please reach out to our Support team by visiting [this page](https://messagebird.com/support-center/Pusher-request-new).
{% endhint %}