magento-test/app/code/Magento/Vault/etc/di.xml

<?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">
    <preference for="Magento\Vault\Model\VaultPaymentInterface" type="Magento\Vault\Model\Method\Vault"/>
    <preference for="Magento\Vault\Api\Data\PaymentTokenInterface" type="Magento\Vault\Model\PaymentToken"/>
    <preference for="Magento\Vault\Api\Data\PaymentTokenFactoryInterface" type="Magento\Vault\Model\PaymentTokenFactory"/>
    <preference for="Magento\Vault\Api\PaymentTokenRepositoryInterface" type="Magento\Vault\Model\PaymentTokenRepository" />
    <preference for="Magento\Vault\Api\PaymentTokenManagementInterface" type="Magento\Vault\Model\PaymentTokenManagement" />
    <preference for="Magento\Vault\Api\PaymentMethodListInterface" type="Magento\Vault\Model\PaymentMethodList" />
    <preference for="Magento\Vault\Api\Data\PaymentTokenSearchResultsInterface" type="Magento\Vault\Model\PaymentTokenSearchResults" />
    <preference for="Magento\Vault\Model\Ui\TokenUiComponentInterface" type="Magento\Vault\Model\Ui\TokenUiComponent" />

    <type name="Magento\Sales\Api\Data\OrderPaymentInterface">
        <plugin name="PaymentVaultExtensionAttributeOperations" type="Magento\Vault\Plugin\PaymentVaultAttributesLoad"/>
    </type>

    <!-- Payment Method configuration -->
    <type name="Magento\Vault\Model\Method\Vault">
        <arguments>
            <argument name="config" xsi:type="object">Magento\Payment\Gateway\Config\Config</argument>
            <argument name="valueHandlerPool" xsi:type="object">VaultPaymentValueHandlerPool</argument>
            <argument name="vaultProvider" xsi:type="object">Magento\Vault\Model\Method\NullPaymentProvider</argument>
            <argument name="code" xsi:type="string">vault</argument>
        </arguments>
    </type>

    <!-- @api create virtual type based on default value handler if it required by payment method -->
    <virtualType name="VaultPaymentDefaultValueHandler" type="Magento\Payment\Gateway\Config\ConfigValueHandler">
        <arguments>
            <argument name="configInterface" xsi:type="object">Magento\Payment\Gateway\Config\Config</argument>
        </arguments>
    </virtualType>
    <!-- @api create virtual type based on default value handler pool if it required by payment method -->
    <virtualType name="VaultPaymentValueHandlerPool" type="Magento\Payment\Gateway\Config\ValueHandlerPool">
        <arguments>
            <argument name="handlers" xsi:type="array">
                <item name="default" xsi:type="string">VaultPaymentDefaultValueHandler</item>
            </argument>
        </arguments>
    </virtualType>

    <type name="Magento\Vault\Model\PaymentTokenFactory">
        <arguments>
            <argument name="tokenTypes" xsi:type="array">
                <item name="account" xsi:type="const">Magento\Vault\Api\Data\PaymentTokenFactoryInterface::TOKEN_TYPE_ACCOUNT</item>
                <item name="credit_card" xsi:type="const">Magento\Vault\Api\Data\PaymentTokenFactoryInterface::TOKEN_TYPE_CREDIT_CARD</item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\Checkout\Api\PaymentInformationManagementInterface">
        <plugin name="ProcessPaymentVaultInformationManagement"
                type="Magento\Vault\Plugin\PaymentVaultInformationManagement"/>
    </type>
</config>