> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# makePasskeySignerCallback

> Kotlin Function

**Function**

```kotlin theme={null}
fun makePasskeySignerCallback(credentialId: String, activityProvider: () -> Activity, credentialManager: CredentialManager, rpId: String = DEFAULT_PASSKEY_RP_ID): suspend (String) -> PasskeySignResult
```

Creates a signing callback for a passkey, ready to pass to DelegatedSigner.PasskeyActivation.