> ## 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.

# UnsupportedPasskeySignerFactory

> Flutter Final Class

**Final Class**

Fallback factory used when the Flutter runtime does not provide a concrete passkey implementation.

```dart theme={null}
final class UnsupportedPasskeySignerFactory implements CrossmintPasskeySignerFactory
```

## Constructors

### UnsupportedPasskeySignerFactory

```dart theme={null}
const UnsupportedPasskeySignerFactory()
```

## Methods

### createPasskeySigner

```dart theme={null}
Future<CrossmintPasskeySignerConfig> createPasskeySigner({
  required String name,
  required CrossmintPasskeyConfig config,
})
```