@digitalpersona/authentication/dist/api/docs/authentication.contactlesscardauth.identify.md

DigitalPersona Authentication API

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[Home](./index.md) &gt; [@digitalpersona/authentication](./authentication.md) &gt; [ContactlessCardAuth](./authentication.contactlesscardauth.md) &gt; [identify](./authentication.contactlesscardauth.identify.md)

## ContactlessCardAuth.identify() method

Identifies the user with a contactless card.

<b>Signature:</b>

```typescript
identify(cardData: string): Promise<JSONWebToken>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  cardData | <code>string</code> | card authentication data received from the card using a <code>CardsReader.getCardAuthData</code>. |

<b>Returns:</b>

`Promise<JSONWebToken>`

a promise to return a JSON Web Token containing a subject identity claims (`sub`<!-- -->, `group`<!-- -->, etc) and a claim (`crd`<!-- -->) showing the fact a contactless card was used. Will reject if identification 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.