<virtualType name="BraintreeCreditCardVaultFacade"
             type="Magento\Vault\Model\Method\Vault">
    <arguments>
        <argument name="config" xsi:type="object">
            BraintreeVaultPaymentConfig
        </argument>
        <argument name="valueHandlerPool" xsi:type="object">
            BraintreeVaultPaymentValueHandlerPool
        </argument>
        <argument name="vaultProvider" xsi:type="object">
            BraintreeFacade
        </argument>
        <argument name="code" xsi:type="const">
            Magento\Braintree\Model\Ui\ConfigProvider::CC_VAULT_CODE
        </argument>
    </arguments>
</virtualType>

This is a virtual type configuration.

This configuration is for the base area. Base area configurations will apply to all the sub-applications.

This virtualType configuration tells the Object Manager when a user wants a virtual BraintreeCreditCardVaultFacade object that it should return a Magento\Vault\Model\Method\Vault object.

This configuration tells the Object Manager that when a user wants a BraintreeCreditCardVaultFacade object that the following arguments should be used in the foo object's constructor.

• $config = new BraintreeVaultPaymentConfig (...)
• $valueHandlerPool = new BraintreeVaultPaymentValueHandlerPool (...)
• $vaultProvider = new BraintreeFacade (...)
• $code = Magento\Braintree\Model\Ui\ConfigProvider::CC_VAULT_CODE;