# Build a custom flow for handling user impersonation

> This guide is for users who want to build a custom flow. To use a _prebuilt_ UI, use the [Account Portal pages](https://clerk.com/docs/guides/account-portal/overview.md?sdk=android) or [prebuilt views](https://clerk.com/docs/android/reference/views/overview.md).

[Clerk's user impersonation feature](https://clerk.com/docs/guides/users/impersonation.md?sdk=android) allows you to sign in to your application as one of your users, enabling you to directly reproduce and remedy any issues they're experiencing. It's a helpful feature for customer support and debugging.

This guide will walk you through how to build a custom flow that handles user impersonation.

> You can perform up to **5 user impersonations per month for free**. To increase this limit, refer to the [pricing page](https://clerk.com/pricing){{ target: '_blank' }}.

```kotlin
import com.clerk.api.Clerk
import com.clerk.api.auth.signInWithTicket
import com.clerk.api.network.serialization.onFailure
import com.clerk.api.network.serialization.onSuccess
import com.clerk.api.signin.SignIn

suspend fun impersonateUser(actorToken: String) {
  Clerk.auth
    .signInWithTicket(actorToken)
    .onSuccess { signIn ->
      if (signIn.status == SignIn.Status.COMPLETE && signIn.createdSessionId != null) {
        Clerk.auth
          .setActive(sessionId = signIn.createdSessionId)
          .onFailure {
            // See https://clerk.com/docs/guides/development/custom-flows/error-handling
            // for more info on error handling
          }
      }
    }
    .onFailure {
      // See https://clerk.com/docs/guides/development/custom-flows/error-handling
      // for more info on error handling
    }
}
```

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