> ## 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.

# How to register your own Revolut Business API app

> Generate a certificate, register it with Revolut Business, and connect it to Nango

This guide shows you how to generate a certificate, upload it to Revolut Business, and obtain your OAuth credentials (Client ID and Private Key). These are required to let merchants grant your app access to their Revolut Business account.

<Steps>
  <Step title="Generate a certificate">
    You need a Command Line Interface (CLI) with `openssl` (e.g. Terminal on macOS, or [WSL](https://learn.microsoft.com/en-us/windows/wsl/install) on Windows).

    1. Navigate to the directory where you want to save the certificate.
    2. Run:
       ```shell theme={null}
       openssl genrsa -out privatekey.pem 2048
       openssl req -new -x509 -key privatekey.pem -out publiccert.cer -days 1825
       ```
    3. You'll be prompted for organization details for the certificate's Distinguished Name. You can leave most fields blank, but at least one (e.g. **Country Name**) is required for the public certificate to generate successfully.

    This creates `privatekey.pem` (keep this — you'll paste it into Nango) and `publiccert.cer` (upload this to Revolut).
  </Step>

  <Step title="Upload your certificate">
    1. Log in to the [Revolut Business web app](https://business.revolut.com/) (or [Sandbox](https://sandbox-business.revolut.com/) for testing), and go to **Business API** settings (gear icon -> **APIs** -> **Business API**).
    2. In **API Certificates**, click **Add API certificate**.
    3. Open `publiccert.cer` in a text editor (or run `cat publiccert.cer`) and paste its full contents — including the `-----BEGIN CERTIFICATE-----`/`-----END CERTIFICATE-----` lines — into the **X509 public key** field.
    4. Set the **OAuth redirect URI** to: `https://api.nango.dev/oauth/callback`.
    5. Give the certificate a meaningful title, then click **Continue**.
    6. Copy the **ClientID** shown in the certificate details — you'll need it when configuring the integration in Nango.

    <Note>
      Optionally, restrict the certificate to specific IP addresses under **IP whitelisting**. If you do, make sure to include [Nango's public IP addresses](/docs/guides/platform/security#ip-allowlist).
    </Note>
  </Step>

  <Step title="Next">
    Follow the [*Quickstart*](/docs/getting-started/quickstart) to connect your first account, using the **Client ID** from this step and the **Private Key** (`privatekey.pem`) you generated.
  </Step>
</Steps>

For more details, see Revolut's [Make your first API request guide](https://developer.revolut.com/docs/guides/manage-accounts/get-started/make-your-first-api-request).

***