> For the complete documentation index, see [llms.txt](https://docs.caf.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.caf.io/caf-sdk/ios/standalone-modules/caffacelivenesslite/start-sdk.md).

# Start Liveness Verification

Quick links: [Overview](/caf-sdk/ios/standalone-modules/caffacelivenesslite.md) | [Building the SDK](/caf-sdk/ios/standalone-modules/caffacelivenesslite/builder.md) | [Start Liveness Verification](/caf-sdk/ios/standalone-modules/caffacelivenesslite/start-sdk.md) | [UI Customization](/caf-sdk/ios/standalone-modules/caffacelivenesslite/ui-customization.md) | [Installation](/caf-sdk/ios/standalone-modules/caffacelivenesslite/installation.md) | [Current Version](/caf-sdk/ios/standalone-modules/caffacelivenesslite/current-version.md) | [Requirements](/caf-sdk/ios/standalone-modules/caffacelivenesslite/requirements.md) | [Source Code](/caf-sdk/ios/standalone-modules/caffacelivenesslite/source-code.md) | [Result Reference](/caf-sdk/ios/standalone-modules/caffacelivenesslite/result-reference.md) | [Release Notes](/caf-sdk/ios/standalone-modules/caffacelivenesslite/release-notes.md) | [FAQ](/caf-sdk/ios/standalone-modules/caffacelivenesslite/faq_caf_face_liveness_sdk.md)

## Calling startSDK

Use `CafFaceLivenessLiteSDK.startSDK` with the required parameters from your view controller.

| Parameter                                 | Required | Description                                                                 |
| ----------------------------------------- | -------- | --------------------------------------------------------------------------- |
| `viewController: UIViewController`        | Yes      | The presenting view controller                                              |
| `mobileToken: String`                     | Yes      | Usage token associated with your CAF account                                |
| `personId: String`                        | Yes      | User identifier                                                             |
| `customLocalization: String?`             | No       | Strings table name for custom iProov localization (e.g., "stringsBundle")   |
| `customLocalizationBundle: Bundle?`       | No       | Bundle containing the custom strings table (iProov `options.stringsBundle`) |
| `uiCustomization: CerttaUiCustomization?` | No       | Visual branding for the liveness screen (default: `nil`, no customization)  |
| `environment: CafEnvironment`             | No       | `.dev`, `.beta`, `.prod` (default: `.prod`)                                 |
| `loading: Bool`                           | No       | Show SDK loading screen (default: `true`)                                   |

{% hint style="warning" %}
**Breaking in 2.0.0:** `executeFaceAuth` was removed. The SDK starts an async transaction and returns only `signedResponse`. Retrieve the final liveness outcome from your backend.
{% endhint %}

### Example

```swift
import CafFaceLivenessLite

class ViewController: UIViewController {
    private let sdk = CafFaceLivenessLiteSDK()

    override func viewDidLoad() {
        super.viewDidLoad()
        sdk.delegate = self
    }

    func startLiteLiveness() {
        sdk.startSDK(
            viewController: self,
            mobileToken: "your_mobile_token",
            personId: "your_person_id",
            customLocalization: nil,
            customLocalizationBundle: nil,
            environment: .prod,
            loading: true
        )
    }
}
```

### Custom localization with a framework bundle

When custom `Localizable.strings` ship inside a framework (or another non-main bundle), pass both the table name and the bundle:

```swift
sdk.startSDK(
    viewController: self,
    mobileToken: "your_mobile_token",
    personId: "your_person_id",
    customLocalization: "Localizable",
    customLocalizationBundle: Bundle(for: CafFaceLivenessLiteSDK.self),
    environment: .prod,
    loading: true
)
```

Localization reference: [iProov Localization](https://github.com/iProov/ios/wiki/Localization)

### UI customization

To brand the liveness screen — header bar, guidance prompt, area around the face oval and font — pass a `CerttaUiCustomization` through the `uiCustomization` parameter. Available from **2.1.0** and fully optional. See [UI Customization](/caf-sdk/ios/standalone-modules/caffacelivenesslite/ui-customization.md).


---

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