> ## Documentation Index
> Fetch the complete documentation index at: https://docs.portalhq.io/llms.txt
> Use this file to discover all available pages before exploring further.

# configureFirebaseStorage

> Configure Firebase Auth as a backup storage method for wallet backup and recovery.

**Function Signature**

```dart theme={null}
Future<void> configureFirebaseStorage({
  required Future<String?> Function() getToken,
})
```

**Parameters**

* **`getToken`** *(required)*: An async callback function that returns a fresh Firebase ID token (`String?`). This is called before each request to the secure enclave. Return `null` if no user is signed in.

**Returns**

* `Future<void>` — Completes when Firebase storage is configured.

**Throws**

* `PlatformException` — If there is an error configuring Firebase storage on the native platform.

**Example Usage**

```dart theme={null}
import 'package:firebase_auth/firebase_auth.dart';
import 'package:portal_flutter/portal_flutter.dart';

final portal = Portal();

await portal.configureFirebaseStorage(
  getToken: () async {
    final user = FirebaseAuth.instance.currentUser;
    if (user == null) return null;
    return await user.getIdToken(true);
  },
);
```

<Note>
  You must call `configureFirebaseStorage()` before using `PortalBackupMethod.firebase` with `backupWallet()` or `recoverWallet()`. The user must be signed in to Firebase before performing backup or recovery operations.
</Note>