> ## 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.

# CrossmintOtpSendCallback

> Flutter Type Alias

**Type Alias**

Called by non-custodial signers to (re-)send an OTP to the user.

```dart theme={null}
typedef CrossmintOtpSendCallback = Future<void> Function()
```