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

# Link a credit note to an invoice [Legacy only]

> Apply a credit note to a specific invoice on legacy Upflow setups, either through your billing tool sync or directly via the Upflow API endpoints.

**Your Upflow platform is integrated with a native integration**

If your Upflow platform is integrated to *NetSuite*, *QuickBooks*, *Stripe Billing*, *Sellsy* or *Xero*, link your credit notes/memos to the corresponding invoice(s) directly in your billing tool. It will then be synchronized from your billing tool to your Upflow platform.

**Your Upflow platform is integrated with our API**

You can link a credit note to an invoice directly from your Upflow platform from the detail of a credit note.

1. Go to your **[Invoices](https://app.upflow.io/organization/-/invoices)** tab
2. Click the **[Credit Notes](https://app.upflow.io/organization/-/creditnotes)** section
3. Click the filter icon in the **Invoices** column, then click **No customer linked**
4. Click the credit note you want to link and select **Link to invoice**
5. Choose the invoice you want to link your credit note to, click on the arrow where you want to apply it, and select **Done**

Any question? [Get in touch](mailto:support@upflow.io)!