> 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/cafsmartauth/lifecycle.md).

# SDK Lifecycle

## CafVerifyPolicyListener

The `CafVerifyPolicyListener` closure handles key events during the SDK's authentication:

| Event                                                                     | Description                                                                            |
| ------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- |
| `onCanceled(failure: CafSmartAuthError)`                                  | Triggered when the user cancels the process, with error details provided in `failure`. |
| `onError(failure: CafSmartAuthError)`                                     | Called on SDK failure, with error details provided in `failure`.                       |
| `onPending(isAuthorized: Bool, attestation: String)`                      | Called when the SDK is waiting for a result.                                           |
| `onLoaded()`                                                              | Triggered when the SDK is ready.                                                       |
| `onLoading()`                                                             | Indicates the SDK is initializing.                                                     |
| `onSuccess(isAuthorized: Bool, attemptId: String?, attestation: String?)` | Called upon successful detection, with the result provided.                            |

### Example

```swift
private func setupListener() -> CafVerifyPolicyListener {
    return { result in
        switch result {
        case .onSuccess(let response):
            print("CafVerifyPolicyListener.onSuccess isAuthorized: \(response.isAuthorized)")
            print("CafVerifyPolicyListener.onSuccess attestation: \(response.attestation)")
        
        case .onPending(let response):
            print("CafVerifyPolicyListener.onPending isAuthorized: \(response.isAuthorized)")
            print("CafVerifyPolicyListener.onPending attestation: \(response.attestation)")
        
        case .onError(let error):
            print("CafVerifyPolicyListener.onError failure: \(error.localizedDescription)")

        case .onCanceled(let error):
            print("CafVerifyPolicyListener.onCanceled failure: \(error.localizedDescription)")
        
        case .onLoading(let isLoading):
            print("CafVerifyPolicyListener.onLoading isLoading: \(isLoading)")
        
        case .onLoaded(let isLoaded):
            print("CafVerifyPolicyListener.onLoaded isLoaded: \(isLoaded)")
        }
    }
}
```


---

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