# 4️⃣ De-Enrollment

De-enrollment is the biometric equivalent of an account deletion. Keyless performs an [authentication](https://docs.keyless.io/consumer/mobile-sdk-guide/authentication) to compare the user's facial biometrics with the ones computed during [enrollment](https://docs.keyless.io/consumer/mobile-sdk-guide/enrollment). If the biometrics match, the user is authenticated and their account will be removed from Keyless. This operation is **irreversible**.

{% tabs %}
{% tab title="Android" %}

```kotlin
val configuration = BiomDeEnrollConfig()

Keyless.deEnroll(
    deEnrollmentConfiguration = configuration,
    onCompletion = { result ->
        when (result) {
            is Keyless.KeylessResult.Success -> Log.d("KeylessSDK ", "De-enroll success")
            is Keyless.KeylessResult.Failure -> Log.d("KeylessSDK ", "De-enroll failure - error code ${result.error.code}")
        }
    }
)
```

{% endtab %}

{% tab title="iOS" %}

```swift
let configuration = BiomDeEnrollConfig()
    .build()

Keyless.deEnroll(
    deEnrollmentConfiguration: configuration,
    onCompletion: { error in
        if let error = error {
              print("De-Enrollment finished with error: \(error.message)")
        } else {
              print("De-Enrollment finished with success")
        }
    }
}
```

{% endtab %}

{% tab title="Android 4.6" %}

```kotlin
val configuration = DeEnrollmentConfiguration.builder.build()

Keyless.deEnroll(
    deEnrollmentConfiguration = configuration,
    onCompletion = { result ->
        when (result) {
            is Keyless.KeylessResult.Success -> Log.d("KeylessSDK ", "De-enroll success")
            is Keyless.KeylessResult.Failure -> Log.d("KeylessSDK ", "De-enroll failure - error code ${result.error.code}")
        }
    }
)
```

{% endtab %}

{% tab title="iOS 4.6" %}

```swift
let configuration = Keyless.DeEnrollmentConfiguration.builder
    .build()

Keyless.deEnroll(
    deEnrollmentConfiguration: configuration,
    onCompletion: { error in
        if let error = error {
              print("De-Enrollment finished with error: \(error.message)")
        } else {
              print("De-Enrollment finished with success")
        }
    }
}
```

{% endtab %}

{% tab title="Flutter" %}

```dart
import 'package:keyless_flutter_sdk/keyless.dart';
import 'package:keyless_flutter_sdk/models/configurations/deenrollment_configuration.dart';

// Biometric de-enrollment
final configuration = BiomDeEnrollConfig(
    livenessConfiguration: LivenessConfiguration.passiveStandaloneHigh,
    livenessTimeout: 60,
    cameraDelaySeconds: 0
);

// Or PIN-based de-enrollment
final configuration = PinDeEnrollConfig(
    pin: "1234"
);

try {
    await Keyless.instance.deEnroll(configuration);
    print("De-enrollment successful");
} catch (error) {
    print("De-enrollment failed: $error");
}
```

{% endtab %}

{% tab title="React Native" %}

```javascript
import Keyless, {
  BiomDeEnrollConfig,
  PinDeEnrollConfig,
  LivenessConfiguration
} from '@react-native-keyless/sdk';

// Biometric de-enrollment
const biometricDeEnroll = async () => {
  const config = new BiomDeEnrollConfig();
  const result = await Keyless.deEnroll(config);
  result.fold({
    onSuccess: () => {
      console.log('De-enrollment successful');
    },
    onFailure: (error) => {
      console.error('De-enrollment failed:', error);
    },
  });
};

// PIN-based de-enrollment
const pinDeEnroll = async () => {
  const config = new PinDeEnrollConfig('1234');
  const result = await Keyless.deEnroll(config);
  result.fold({
    onSuccess: () => {
      console.log('De-enrollment successful');
    },
    onFailure: (error) => {
      console.error('De-enrollment failed:', error);
    },
  });
};
```

{% endtab %}
{% endtabs %}

## DeEnrollment configuration

### Camera Delay

Use `cameraDelaySeconds` to specify the delay (in seconds) between when the camera preview appears, and when the liveness processing starts.

### Success Feedback

Use `showSuccessFeedback` to show a `Success` text on top of the screen when the DeEnroll is successful.

### Liveness Settings

Using `livenessConfiguration` you can configure the liveness security level during enrollment. The possible liveness configuration are under `LivenessSettings.LivenessConfiguration` :

```
DEVELOPMENT
LEVEL_1        //recommended configuration
LEVEL_2
```

You can also specify a `livenessEnvironmentAware` that is by default se to `true` to enhance liveness detection. This parameters helps to ensure the user is in a suitable setting for verification.

More details on liveness in the dedicated [liveness settings](https://docs.keyless.io/consumer/mobile-sdk-reference/liveness-settings) section.