@digitalpersona/authentication/dist/api/docs/authentication.faceauth.authenticate.md

DigitalPersona Authentication API

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[Home](./index.md) &gt; [@digitalpersona/authentication](./authentication.md) &gt; [FaceAuth](./authentication.faceauth.md) &gt; [authenticate](./authentication.faceauth.authenticate.md)

## FaceAuth.authenticate() method

Authenticates the user using their face images.

<b>Signature:</b>

```typescript
authenticate(identity: User | JSONWebToken, samples: BioSample[]): Promise<JSONWebToken>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  identity | <code>User &#124; JSONWebToken</code> | a  or a JSON Web Token. |
|  samples | <code>BioSample[]</code> | a collection of biometric samples with face images. |

<b>Returns:</b>

`Promise<JSONWebToken>`

a promise to return a JSON Web Token containing a claim (`crd`<!-- -->) showing the fact a face was used. Will reject if authentication fails.

## Remarks

If the `identity` parameter is a user name, a new token will be created. If the `identity` parameter is a JSON Web Token, an updated token will be returned.