<type name="Magento\AuthorizenetAcceptjs\Gateway\Command\FetchTransactionInfoCommand">
    <arguments>
        <argument name="handler" xsi:type="object">
            AuthorizenetAcceptjsPaymentReviewStatusHandler
        </argument>
    </arguments>
</type>

This is a type configuration.

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

This configuration tells the Object Manager that when a user wants a Magento\AuthorizenetAcceptjs\Gateway\Command\FetchTransactionInfoCommand object that the following arguments should be used in the foo object's constructor.

• $handler = new AuthorizenetAcceptjsPaymentReviewStatusHandler (...)

<virtualType name="AuthorizenetAcceptjsPaymentReviewStatusHandler"
             type="Magento\Payment\Gateway\Response\HandlerChain">
    <arguments>
        <argument name="handlers" xsi:type="array">
            <item name="payment_status" xsi:type="string">
                Magento\AuthorizenetAcceptjs\Gateway\Response\PaymentReviewStatusHandler
            </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 AuthorizenetAcceptjsPaymentReviewStatusHandler object that it should return a Magento\Payment\Gateway\Response\HandlerChain object.

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

• $handlers = [...items...];