magento-test/app/code/Magento/Payment/etc/payment.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<payment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Payment:etc/payment.xsd">
    <credit_cards>
        <type id="AE" order="0">
            <label>American Express</label>
        </type>
        <type id="VI" order="10">
            <label>Visa</label>
        </type>
        <type id="MC" order="20">
            <label>MasterCard</label>
        </type>
        <type id="DI" order="30">
            <label>Discover</label>
        </type>
        <type id="SM" order="40">
            <label>Maestro/Switch</label>
        </type>
        <type id="SO" order="45">
            <label>Solo</label>
        </type>
        <type id="JCB" order="50">
            <label>JCB</label>
        </type>
        <type id="OT" order="1000">
            <label>Other</label>
        </type>
        <type id="DN" order="60">
            <label>Diners</label>
        </type>
        <type id="MI" order="80">
            <label>Maestro International</label>
        </type>
        <type id="MD" order="100">
            <label>Maestro Domestic</label>
        </type>
        <type id="HC" order="110">
            <label>Hipercard</label>
        </type>
        <type id="ELO" order="120">
            <label>Elo</label>
        </type>
        <type id="AU" order="130">
            <label>Aura</label>
        </type>
    </credit_cards>
</payment>