> For the complete documentation index, see [llms.txt](https://docs.digitalriver.com/commerce-api-references/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.digitalriver.com/commerce-api-references/commerce-api-reference-guide/api-structure/troubleshooting-api-calls.md).

# Troubleshooting API calls

{% hint style="info" %}
The examples in this section use `your_access_token` as a placeholder for an actual token.
{% endhint %}

## 401 Error

### Issue

A 401 error occurs when there is a bad Dispatch token or Global Commerce User API token.

### Resolution

Send an API call to identify where the token originated and when it expired. For example:

{% tabs %}
{% tab title="HTTP" %}

```http
GET /oauth20/access-tokens?token=your_access_token  HTTP/1.1
Host: api.digitalriver.com
```

{% endtab %}
{% endtabs %}

The response shows you where the token originated in the domain field and when it expired in the `expiresIn` field.