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[Home](./index.md) &gt; [@digitalpersona/authentication](./authentication.md) &gt; [SmsOtpAuth](./authentication.smsotpauth.md)

## SmsOtpAuth class

A one-time password authentication API based on a Short Message Service (SMS OTP). SMS OTP supports only authentication. Identification is not supported.

<b>Signature:</b>

```typescript
export declare class SmsOtpAuth extends Authenticator 
```

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(authService)](./authentication.smsotpauth.(constructor).md) |  | Constructs a new SMS OTP authentication API object. |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [authenticate(identity, code)](./authentication.smsotpauth.authenticate.md) |  | Authenticates the user using a challenge sent to the user's registered mobile device via SMS. |
|  [sendChallenge(user)](./authentication.smsotpauth.sendchallenge.md) |  | Sends an SMS challenge with a OTP code to the user's registered mobile device. |