# Subscribe contacts to app inbox campaigns

When app inbox is properly configured, and SDKs are integrated in your application, an app inbox will be created for the contact. This enables you to build user [Journeys](https://docs.bird.com/applications/automation/journeys) that include sending app inbox messages.

In order to include the contact in app inbox [Campaigns](https://docs.bird.com/applications/campaigns/campaigns), you can subscribe the contact by setting the `subscribedAppInbox` attribute.

{% tabs %}
{% tab title="Android (Kotlin)" %}

```kotlin
val attributes = Attributes()
    .put("displayName", "Roy Glass")
    .put("subscribedAppInbox", true)
bird?.contact?.putAttributes(attributes) 
```

{% endtab %}

{% tab title="iOS (Swift)" %}

```swift
let attributes = Attributes()
    .put("displayName", "Roy Glass")
    .put("subscribedAppInbox", true)
bird?.contact.putAttributes(attributes: attributes)
```

{% endtab %}

{% tab title="Web (JavaScript)" %}

```javascript
Bird.eventTarget.addEventListener('bird-sdk-initialized', async () => {
  await Bird.contact.putAttributes({
    displayName: "Roy Glass",
    subscribedAppInbox: true,
  });
});
```

{% endtab %}
{% endtabs %}