<virtualType name="BraintreeGooglePayValueHandlerPool"
             type="Magento\Payment\Gateway\Config\ValueHandlerPool">
    <arguments>
        <argument name="handlers" xsi:type="array">
            <item name="default" xsi:type="string">
                BraintreeGooglePayConfigValueHandler
            </item>
        </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 BraintreeGooglePayValueHandlerPool object that it should return a Magento\Payment\Gateway\Config\ValueHandlerPool object.

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

• $handlers = [...items...];

<virtualType name="BraintreeGooglePayConfigValueHandler"
             type="Magento\Payment\Gateway\Config\ConfigValueHandler">
    <arguments>
        <argument name="configInterface" xsi:type="object">
            BraintreeGooglePayConfig
        </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 BraintreeGooglePayConfigValueHandler object that it should return a Magento\Payment\Gateway\Config\ConfigValueHandler object.

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

• $configInterface = new BraintreeGooglePayConfig (...)