> For the complete documentation index, see [llms.txt](https://help.smallbuilder.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.smallbuilder.com/smallbuilder-line-items/getting-started/eca-setup.md).
# External Client App (ECA) Setup
To perform metadata-related tasks in the **SmallBuilder Line Items builder** — such as **creating buttons or adding buttons to page layouts** — additional configuration is required for the External Client App provided by SmallBuilder Line Items.
### Configuration steps
1. In **Setup**, enter External Client App in the Quick Find box and select **External Client App Manager**.
2. Click **SmallBuilderLineItems**.
3. Click **Edit**.
4. Under **OAuth Policies**, set **Permitted Users** to **Admin approved users are pre-authorized**.
5. Under **App Policies**, select the **profile or permission set responsible for configuring the builder**.
6. Click **Save**.
