## Event Token

### uuid

**Required**  
Globally unique identifier for the authorization event that triggered the challenge.

### Card program's response to Authorization Challenge

### response

**string**  
**enum**  
**Required**  
Whether the cardholder has approved or declined the issued challenge.  
**Allowed:**  
`APPROVE`  
`DECLINE`

### Responses

```
200
Challenge response recorded

400
Invalid request (e.g. challenge method does not support this endpoint)

404
Challenge not found

409
Challenge has already been completed

410
Challenge has expired

500
Lithic Error
```

* * *

### Code Example

```shell
curl --request POST \
     --url https://sandbox.lithic.com/v1/card_authorizations/event_token/challenge_response \
     --header 'content-type: application/json' \
     --data '\n{\n  "response": "APPROVE"\n}\n'
```

Click `Try It!` to start a request and see the response here!