Enforcing Strong Customer Authentication {#opencart-config-sca}
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Select the Enforce Strong Customer Authentication setting to prompt a `3-D Secure` challenge when a customer saves their credit card information. The customer is `3-D Secure` challenged when a transaction is declined as reported by response code `478` (Strong Customer Authentication required). After the transaction is declined, another request is sent for the same order.  
The Enforce Strong Customer Authentication setting is only available when the Payer Authentication/` 3-D Secure ` (General Plugin setting) and Tokenization (Fraud Management Plugin setting) are enabled. See [Enable 3-D Secure (Payer Auth)](/docs/cybs/en-us/isv-plugins/admin/all/na/isv-plugin-o/built-by-us/opencart-overview/opencart-config-3ds.md "") and [Enable Tokenization](/docs/cybs/en-us/isv-plugins/admin/all/na/isv-plugin-o/built-by-us/opencart-overview/opencart-config-token.md "") for information about enabling these settings.  
Follow these steps to enable Enforce Strong Customer Authentication:

1. Open `OpenCart` Back Office and select Extensions \> Extensions \> Payments \> `Cybersource` `Unified Checkout`.
2. Select the Edit icon.
3. From the drop down menu next to Enforce SCA for Saving Card, select **Enable**.
4. Click the Save icon.