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I want to make changes(PHP code) to the method processPaymentConfiguration, but I don't know how I can override the method so my changes have a higher priority. I can alter the LayoutProcessor file but it's never good to apply changes to a core file.

So my question; is this possible and what do I need to do to achieve this?

Vendor/Module/Block/Checkout/LayoutProcessor.php

<?php
namespace VendorModuleBlockCheckout;

use MagentoFrameworkAppObjectManager;
use MagentoCheckoutBlockCheckoutLayoutProcessorInterface;
use MagentoCustomerModelAttributeMetadataDataProvider;
use MagentoUiComponentFormAttributeMapper;
use MagentoCheckoutBlockCheckoutAttributeMerger;
use MagentoCustomerModelOptions;

class LayoutProcessor implements LayoutProcessorInterface

 private $attributeMetadataDataProvider;
 protected $attributeMapper;
 protected $merger;
 private $options;

 public function __construct(
 AttributeMetadataDataProvider $attributeMetadataDataProvider,
 AttributeMapper $attributeMapper,
 AttributeMerger $merger
 ) 
 $this->attributeMetadataDataProvider = $attributeMetadataDataProvider;
 $this->attributeMapper = $attributeMapper;
 $this->merger = $merger;
 

 private function getOptions()
 
 //same code as Magento/Checkout/Block/LayoutProcessor::getOptions()
 


 private function getAddressAttributes()
 
 //same code as Magento/Checkout/Block/LayoutProcessor::getAddressAttributes()
 

 private function convertElementsToSelect($elements, $attributesToConvert)
 
 //same code as Magento/Checkout/Block/LayoutProcessor::convertElementsToSelect()
 

 public function process($jsLayout)
 
 //same code as Magento/Checkout/Block/LayoutProcessor::process()
 

 private function processPaymentConfiguration(array &$configuration, array $elements)
 
 /*
 code from Magento/Checkout/Block/LayoutProcessor::processPaymentConfiguration()
 with a couple changes.
 It works when I apply the changes in code file (vendor/magento/magento-checkout/...)
 */
 

When I var_dump processPaymentConfigurationfrom the core and my custom code, I get the same results. So it looks like the code executes and returns the right thing but nothing is happening.

Vendor/Module/etc/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">
 <preference for="MagentoCheckoutBlockCheckoutLayoutProcessor" type="VendorModuleBlockCheckoutLayoutProcessor" />
</config>

you have to "extend" the class not "implement" interface..

class LayoutProcessor extends MagentoCheckoutBlockCheckoutLayoutProcessor

1. Create your own module if you do not have created it yet.



2. Implement MagentoCheckoutBlockCheckoutLayoutProcessorInterface::process in your module through YourModule/etc/frontend/di.xml.
   Check implementation in MagentoCheckoutBlockCheckoutLayoutProcessor::process as a reference



3. 
   

   In your new implementation of LayoutProcessorInterface::process method get all payment methods by

   
   
   

   $paymentList = $jsLayout['components']['checkout']['children']['steps']['children']['billing-step']['children']['payment']['children']['payments-list']['children'] ?? null;

   
   



4. Iterate through this payment list and modify layout configuration as needed.




5. Return modified $jsLayout from your implementation of LayoutProcessorInterface::process method.