Install the Shopify Extension {#shopify-install}
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Install the `Cybersource` app in your `Shopify` account for testing or production.
You must enable the `Cybersource` extension in your `Shopify` account settings. You can install the `Shopify` extension in test (CAS) if you are using a sandbox account. Install the plugin in a live (production) environment when you complete the go-live process.

1. Go to [cybersource-cas](https://apps.shopify.com/cybersource-cas "").

2. Select the extension and click Install.

3. A page opens on `Shopify`. Provide the required permissions to the payment app.

4. After you set the permissions, the `Business Center` login appears.

5. Log in to the `Business Center` with your `Cybersource` credentials. This must be your transacting merchant ID. An agreement page appears.

6. Check or clear the 3-D Secure enrollment box based on your business needs. If you enroll for 3-D Secure, ensure that the `Payer Authentication` feature is enabled and configured.

7. Submit the form. The `Shopify` store settings page re-opens so that you can configure and activate the `Cybersource` extension.

   #### ADDITIONAL INFORMATION

You must repeat these steps if you have more than one `Shopify` store.