The Payment Provider Gateway documentation uses the Magento 2.3.x version of the Braintree module as a reference application. The Braintree module was removed in Magento 2.4.0. The concepts described in this guide are still applicable to Magento 2.4.0, but the code samples are not supported.
This is a beta release of documentation for Magento 2.4, published for previewing soon-to-be-released functionality. Content in this version is subject to change. Links to the v2.4 code base may not properly resolve until the code is officially released.

Gateway Command Pool

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Gateway command pool

All gateway commands implemented for a particular payment provider, should be added to a command pool for this provider. A command pool is a set of gateway commands available for integration with a particular payment provider. The pool is added to the configuration of the payment provider using dependency injection.

Interface

The basic interface for a command pool is \Magento\Payment\Gateway\Command\CommandPoolInterface. It implements the Pool pattern

Default implementation

The default CommandPool implements CommandPoolInterface and takes a list of commands as an optional argument for the constructor.

Command pool configuration for a particular provider

Following is an example of the command pool configuring for the Braintree payment provider, and adding it to the provider’s payment method configuration (app/code/Magento/Braintree/etc/di.xml).

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...
<!-- BrainreeCommandPool - a command pool for the Braintree payments provider -->
<virtualType name="BraintreeCommandPool" type="Magento\Payment\Gateway\Command\CommandPool">
    <arguments>
        <argument name="commands" xsi:type="array">
            <item name="authorize" xsi:type="string">BraintreeAuthorizeCommand</item>
            <item name="sale" xsi:type="string">BraintreeSaleCommand</item>
            <item name="capture" xsi:type="string">BraintreeCaptureStrategyCommand</item>
            ...
        </argument>
    </arguments>
</virtualType>
...
<!-- Adding BrainreeCommandPool to the Braintree payment method configuration:-->
<virtualType name="BraintreeFacade" type="Magento\Payment\Model\Method\Adapter">
    <arguments>
        ...
        <argument name="commandPool" xsi:type="object">BraintreeCommandPool</argument>
    </arguments>
</virtualType>
...

(The code sample is from Magento Open Source v2.1. Although the payment provider gateway was added in v2.0, the particular default implementation using the gateway were added in v2.1.)

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