# Customer.io authentication

> To create a connection, you need the following credentials:

## Prerequisites

To create a connection, you need the following credentials:

* **API key**
* **Site ID**

To learn more about Customer.io API authentication and how to retrieve your credentials, refer to the Customer.io [authentication](https://customer.io/docs/api/track/#section/Authentication) documentation.

## Add the Customer.io connection

1. Select Orchestrator from the product launcher.
2. Select a folder, and then navigate to the **Connections** tab.
3. Select **Add connection**.
4. To open the connection creation page, select the connector from the list. You can use the search bar to find the connector.
5. Enter the required credentials and select **Connect**.

   For any secret-type field, you can select the menu next to the field and choose **Use credential asset** to reference an Orchestrator credential asset linked to an external vault instead of entering the value directly. For more information, see [Use credential assets for connections](credential-store-connections.md).