Installing the Cybersource App on `Shopify` {#shopify-install}
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You must enable the Cybersource app in your `Shopify` account settings. You can install the Cybersource CAS app if you are using a sandbox account, or the live app if you have completed the go live process.

Installing the Cybersource CAS App {#shopify-install_section_vdt_h35_52c}
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Follow these steps to install the Cybersource CAS app:
1. Go to [cybersource-cas](https://apps.shopify.com/cybersource-cas "")
2. Select the app 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` log in opens.
5. Log in to the `Business Center` with your Cybersource credentials. This must be your transacting merchant ID. An agreement page opens.
6. Check or clear the 3-D Secure enrollment box based on your business needs. If you choose to 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 app.
8. You must repeat these steps if you have more than one `Shopify` store.

Installing the Cybersource Live App {#shopify-install_section_f2y_h35_52c}
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Follow these steps to install the Cybersource live app:
1. Go to <https://apps.shopify.com/cybersource>.
2. Select the app 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` log in opens.
5. Log in to the `Business Center` with your Cybersource credentials. This must be your transacting merchant ID. An agreement page opens.
6. Check or clear the 3-D Secure enrollment box based on your business needs. If you choose to 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 app.
8. You must repeat these steps if you have more than one `Shopify` store.