> 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/caffaceliveness/faq_caf_face_liveness_sdk.md).

# FAQ

***

## **1. What is the CAF Face Liveness SDK and what is its main functionality?**

**Answer:**

The CAF Face Liveness SDK provides a solution for verifying whether the face captured by a mobile device's camera is from a live person and not a photo, video, or other forms of spoofing. It’s widely used in scenarios where identity verification is crucial, such as KYC (Know Your Customer), fraud prevention, and secure access.

***

## **2. What are the system requirements for the CAF Face Liveness SDK on iOS?**

**Answer:**

The SDK supports iOS 13.0 and above, ensuring compatibility with modern iOS devices. Your iOS project should meet the **minimum target of iOS 13.0**.

For more requirement details, such as Xcode and Swift versions, please refer to the [Requirements section](/caf-sdk/ios/standalone-modules/caffaceliveness/requirements.md).

***

## **3. What permissions are required to use the SDK?**

**Answer:**

The SDK requires the following permissions:

* Camera access (`NSCameraUsageDescription` in `Info.plist`)
* Internet access (`NSAppTransportSecurity` for network requests, if necessary)

Ensure these permissions are properly declared in your app's `Info.plist` file and handle permission requests appropriately.

***

## **4. How do I integrate the CAF Face Liveness SDK into my iOS project?**

**Answer:**

To integrate the SDK:

1. Add the SDK framework to your Xcode project.
2. Configure necessary permissions for the camera and internet access in your app’s `Info.plist`.
3. Initialize the SDK in your application's lifecycle, typically within `viewDidLoad()` of your main view controller.

For detailed instructions, please refer to the [Builder setup section](/caf-sdk/ios/standalone-modules/caffaceliveness/builder.md)

***

## **5. What is the current version of the SDK, and where can I find version-specific details?**

**Answer:**

The current version of the SDK is regularly updated. You can find the latest version information, including changelogs and version-specific details, [here](/caf-sdk/ios/standalone-modules/caffaceliveness/current-version.md).

***

## **6. How do I start the Face Liveness verification process in my app?**

**Answer:**

To start the liveness check, follow these steps:

1. Build the liveness session using the SDK’s builder.
2. Start the liveness verification by calling the `startSDK()` method.
3. Capture the result in the delegate methods.

For more details on how to initiate the process, refer to the [Start SDK section](/caf-sdk/ios/standalone-modules/caffaceliveness/start-sdk.md).

***

## **7. What are the typical errors or issues that could occur, and how can I troubleshoot them?**

**Answer:**

Some common errors include:

* **Camera permission not granted**: Ensure your app requests the necessary permissions at runtime.
* **SDK initialization failure**: Check your SDK setup and ensure it is properly initialized in the app lifecycle.
* **Network errors**: Ensure the device has an active internet connection for the liveness check to succeed.

For more troubleshooting details, refer to the [References section](/caf-sdk/ios/standalone-modules/caffaceliveness/references.md).


---

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