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We have an extension that has a block class that implements the \Magento\Checkout\Block\Checkout\LayoutProcessorInterface

I need to add a custom field in checkout so I created my own plugin of Magento\Checkout\Block\Checkout\LayoutProcessor which works as expected.

But when I create a plugin of the LayoutProcessor class of the extension, it doesn't work. I can't see my custom field. But it should work right? As the class extension is implementing the LayoutProcessorInterface

Now my question is why is my plugin not working,when the class implements the LayoutProcessorInterface?

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Try this format

Namespace/Module/etc/frontend/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Checkout\Block\Checkout\LayoutProcessor">
    <plugin name="custom-checkout" type="Namespace\Module\Plugin\PluginName" sortOrder="10"/>
</type>
</config>

Namespace\Module\Plugin\PluginName.php

<?php
namespace Module\Namespace\Plugin;
class PluginName
{
    public function afterProcess(\Magento\Checkout\Block\Checkout\LayoutProcessor $processor, $jsLayout){

    $test = 'test';

    $newField = [
        'component' => 'Magento_Ui/js/form/element/abstract',
        'config' => [
            'customScope' => 'shippingAddress.custom_attributes',
            'customEntry' => null,
            'template' => 'ui/form/field',
            'elementTmpl' => 'ui/form/element/input',
            'tooltip' => [
                'description' => 'description'
            ]
        ],
        'dataScope' => 'shippingAddress.custom_attributes.' . $test,
        'label' => 'Custom Label',
        'provider' => 'checkoutProvider',
        'sortOrder' => 0,
        'validation' => [
            'required-entry' => true
        ],
        'options' => [],
        'filterBy' => null,
        'customEntry' => null,
        'visible' => true
    ];

    $jsLayout['components']['checkout']['children']['steps']['children']['shipping-step']['children']['shippingAddress']['children']['shipping-address-fieldset']['children'][$test2] = $newField;

    return $jsLayout;
    }
}

To extend the private method Event-Observer should be used

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