> For the complete documentation index, see [llms.txt](https://dev.ucommerce.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.ucommerce.net/readme/headless/headless-api-authentication/authorization-scopes.md).

# Authorization Scopes

Scopes grants clients access to functionality reserved for special permissions. You can request one or more of the scopes listed below in the query parameter `scope` [when authenticating a client](/readme/headless/headless-api-authentication.md).

The following scopes are available:

| Scope                     | Functionality     | Description                                          |
| ------------------------- | ----------------- | ---------------------------------------------------- |
| transactions:custom:price | Custom Unit Price | Add or update a custom price or tax for a line item. |

Example:

```bash
curl -D- -G <base_url>/api/v1/oauth/connect \
    -d client_id=<CLIENT_ID> \
    -d redirect_uri=<REDIRECT_URL> \
    -d scope="transactions:custom:price" \
    -d response_type=code 
```