<virtualType name="BraintreeFacade"
             type="Magento\Payment\Model\Method\Adapter">
    <arguments>
        <argument name="code" xsi:type="const">
            Magento\Braintree\Model\Ui\ConfigProvider::CODE
        </argument>
        <argument name="formBlockType" xsi:type="string">
            Magento\Braintree\Block\Form
        </argument>
        <argument name="infoBlockType" xsi:type="string">
            Magento\Braintree\Block\Info
        </argument>
        <argument name="valueHandlerPool" xsi:type="object">
            BraintreeValueHandlerPool
        </argument>
        <argument name="validatorPool" xsi:type="object">
            BraintreeValidatorPool
        </argument>
        <argument name="commandPool" xsi:type="object">
            BraintreeCommandPool
        </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 BraintreeFacade object that it should return a Magento\Payment\Model\Method\Adapter object.

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

• $code = Magento\Braintree\Model\Ui\ConfigProvider::CODE;
• $formBlockType = "Magento\Braintree\Block\Form";
• $infoBlockType = "Magento\Braintree\Block\Info";
• $valueHandlerPool = new BraintreeValueHandlerPool (...)
• $validatorPool = new BraintreeValidatorPool (...)
• $commandPool = new BraintreeCommandPool (...)