<xs:attribute name="CVC_Result" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">A response from the validation of the Card Verification Code (CVC/CSC- Card Security Code or CVV/CVS Card Verification Value), a security feature for credit card transactions.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="Match">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The CV code entered matches what is in the customer file. </xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="DoesNotMatch">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The CV code entered does not match what is in the customer file. </xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="NotProcessed">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The CV code could not be processed. </xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="Required">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The CV code was not provided but is required.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="IssuerNotCertified">
                <xs:annotation>
                    <xs:documentation xml:lang="en">The issuer is not authorized to use this CV code.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>