<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Quote\Api\Data\PaymentInterface">
        <attribute code="cca_response" type="string" />
    </extension_attributes>
    <extension_attributes for="Magento\Sales\Api\Data\OrderPaymentInterface">
        <attribute code="cca_response" type="string" />
    </extension_attributes>

</config>

