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

# Back Market

> Integrate your application with the Back Market API

## 🚀 Quickstart

Connect to Back Market with Nango and see data flow in 2 minutes.

<Steps>
  <Step title="Create an integration">
    In Nango ([free signup](https://app.nango.dev)), go to [Integrations](https://app.nango.dev/dev/integrations) -> *Configure New Integration* -> *Back Market*.
  </Step>

  <Step title="Authorize Back Market">
    Go to [Connections](https://app.nango.dev/dev/connections) -> *Add Test Connection* -> *Authorize*, then enter your platform and API token. Later, you'll let your users do the same directly from your app.
  </Step>

  <Step title="Call the Back Market API">
    Let's make your first request to the Back Market API (list your listings). Replace the placeholders below with your [secret key](https://app.nango.dev/dev/environment-settings), [integration ID](https://app.nango.dev/dev/integrations), and [connection ID](https://app.nango.dev/dev/connections):

    <Tabs>
      <Tab title="cURL">
        ```bash theme={null}
        curl "https://api.nango.dev/proxy/ws/listings" \
          -H "Authorization: Bearer <NANGO-SECRET-KEY>" \
          -H "Provider-Config-Key: <INTEGRATION-ID>" \
          -H "Connection-Id: <CONNECTION-ID>"
        ```
      </Tab>

      <Tab title="Node">
        Install Nango's backend SDK with `npm i @nangohq/node`. Then run:

        ```typescript theme={null}
        import { Nango } from '@nangohq/node';

        const nango = new Nango({ secretKey: '<NANGO-SECRET-KEY>' });

        const response = await nango.get({
            endpoint: '/ws/listings',
            providerConfigKey: '<INTEGRATION-ID>',
            connectionId: '<CONNECTION-ID>'
        });

        console.log(response.data);
        ```
      </Tab>
    </Tabs>

    Or fetch credentials dynamically via the [Node SDK](/docs/reference/sdks/node#get-a-connection-with-credentials) or [API](/docs/reference/api/connection/get).

    ✅ You're connected! Check the [Logs](https://app.nango.dev/dev/logs) tab in Nango to inspect requests.
  </Step>

  <Step title="Implement Nango in your app">
    Follow our [Auth implementation guide](/docs/guides/primitives/auth) to integrate Nango in your app.
  </Step>
</Steps>

## 📚 Back Market Integration Guides

Nango-maintained guides for common use cases.

* [How do I link my account?](/docs/api-integrations/back-market/connect)\
  Connect your Back Market account using the Connect UI

Official docs: [Back Market API Guidelines](https://api.backmarket.dev/)

<Tip>
  Back Market runs three separate platforms — EU (`backmarket.fr`), US/NA (`backmarket.com`), and AP (`backmarket.co.jp`) — each with its own seller account, API token, and preprod (sandbox) environment. A seller account on one platform or environment cannot authenticate against another.
</Tip>

<a id="country-code-and-user-agent" />

## ⚙️ Country code and user-agent

The Country Code and User-Agent aren't something Nango asks each seller for — they belong to your app, not to any individual Back Market seller account. Set them once as [connection config defaults](/docs/reference/backend/http-api/connect/sessions/create) instead:

```json theme={null}
{
    "integrations_config_defaults": {
        "back-market": {
            "connection_config": {
                "countryCode": "fr-fr",
                "userAgent": "BM-{CompanyName}-{IntegrationName};contact@yourdomain.com"
            }
        }
    }
}
```

## 🧩 Pre-built syncs & actions for Back Market

Enable them in your dashboard. Extend and customize to fit your needs.

*No pre-built syncs or actions available yet.*

<Tip>Not seeing the integration you need? [Build your own](/docs/guides/functions/functions-guide) independently.</Tip>

***