> For the complete documentation index, see [llms.txt](https://doc.wearepatchworks.com/product-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.wearepatchworks.com/product-documentation/connectors-and-instances/patchworks-connectors/carma-prebuilt-connector.md).

# Carma (prebuilt connector)

## Description

Carma's Tree-Commerce empowers your customers to support environmental initiatives by planting trees or kelp with each purchase, fostering loyalty and increasing sales.

## Authentication

When adding connector instances for *Carma*, the following authentication methods are supported:

* [Client credentials](#client-credentials)

### Client credentials

When a user chooses to [add a connector instance](/product-documentation/connectors-and-instances/working-with-instances/adding-an-instance.md) using **client credentials** authentication, the credentials below are prompted:

<table><thead><tr><th>Credential</th><th data-type="checkbox">Required?</th><th>Notes</th></tr></thead><tbody><tr><td><code>name</code></td><td>true</td><td>This is your Carma <code>client_id</code>.</td></tr><tr><td><code>email</code></td><td>true</td><td>This is your Carma <code>client_secret</code>.</td></tr><tr><td><code>base_url</code></td><td>true</td><td>Enter the URL for the required Carma environment - for example: <code>https://admin-staging.carma.earth/api</code></td></tr></tbody></table>