> ## 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.

# CrossmintOtpRejectCallback

> Flutter Type Alias

**Type Alias**

Called to cancel a pending OTP challenge, optionally with an error cause.

```dart theme={null}
typedef CrossmintOtpRejectCallback = void Function([Object? error])
```