> ## Documentation Index
> Fetch the complete documentation index at: https://docs.delivery-api.express.ci/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Management

> This section covers the different types of errors that you might encounter while using the Express Delivery Order API, along with their meanings and suggested actions.

### 4XX Client Errors

4XX errors indicate that there was a problem with the request made by the client. These errors are usually caused by incorrect input or unauthorized access.

**Example Response:**

```json theme={null}
{
  "error": {
    "code": "Unauthorized",
    "message": "Missing or invalid API token."
  }
}
```

### 5XX Server Errors

5XX errors indicate that the server encountered an unexpected condition that prevented it from fulfilling the request.