> 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/android/standalone-modules/cafsmartauth/lifecycle.md).

# SDK Lifecycle

## CafVerifyPolicyListener

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

| Event                                                                      | Description                                                 |
| -------------------------------------------------------------------------- | ----------------------------------------------------------- |
| onCancel()                                                                 | Triggered when the user cancels the process.                |
| onError(failure: CafFailure)                                               | Called on SDK failure, with error details provided.         |
| onPending(isAuthorized: Boolean, attestation: String)                      | Called when the SDK is waiting for the a result.            |
| onLoaded()                                                                 | Triggered when the finished an operation.                   |
| onLoading()                                                                | Indicates the SDK is starting an operation.                 |
| onSuccess(isAuthorized: Boolean, attemptId: String?, attestation: String?) | Called upon successful detection, with the result provided. |

### Example

```kotlin
    private fun setupListener() = object : CafVerifyPolicyListener {
        override fun onSuccess(
            isAuthorized: Boolean,
            attemptId: String?,
            attestation: String?
        ) {
            println("CafVerifyPolicyListener.onSuccess isAuthorized: $isAuthorized")
            println("CafVerifyPolicyListener.onSuccess attemptId: $attemptId")
            println("CafVerifyPolicyListener.onSuccess attestation: $attestation")
        }

        override fun onPending(isAuthorized: Boolean, attestation: String) {
            println("CafVerifyPolicyListener.onPending isAuthorized: $isAuthorized")
            println("CafVerifyPolicyListener.onPending attestation: $attestation")
        }

        override fun onError(failure: CafFailure) {
            println("CafVerifyPolicyListener.onError failure: ${failure.message}")
        }

        override fun onCancel() {
            println("CafVerifyPolicyListener.onCancel")
        }

        override fun onLoading() {
            println("CafVerifyPolicyListener.onLoading")
        }

        override fun onLoaded() {
            println("CafVerifyPolicyListener.onLoaded")
        }
    }
```


---

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