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<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Config\Model\Config\TypePool">
        <arguments>
            <argument name="sensitive" xsi:type="array">
                <item name="payment/checkmo/mailing_address" xsi:type="string">1</item>
            </argument>
        </arguments>
    </type>
    <type name="\Magento\Quote\Model\QuoteManagement">
        <plugin name="validate_purchase_order_number" type="Magento\OfflinePayments\Plugin\ValidatePurchaseOrderNumber"/>
    </type>
</config>