Reader.php

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<?php
namespace Magento\Paypal\Model\Config\Rules;

use Magento\Framework\Config\FileResolverInterface;
use Magento\Framework\Config\SchemaLocatorInterface;
use Magento\Framework\Config\ValidationStateInterface;
use Magento\Framework\DataObject;
use Magento\Framework\Config\Reader\Filesystem;
use Magento\Paypal\Helper\Backend;

class Reader extends Filesystem
{
    protected $_idAttributes = [
        '/rules/payment' => 'id',
        '/rules/payment(/relation)+' => 'target'
    ];

    public function __construct(
        FileResolverInterface $fileResolver,
        Converter $converter,
        SchemaLocatorInterface $schemaLocator,
        ValidationStateInterface $validationState,
        Backend $helper,
        $fileName = 'adminhtml/rules/payment_{country}.xml',
        $idAttributes = [],
        $domDocumentClass = \Magento\Framework\Config\Dom::class,
        $defaultScope = 'primary'
    ) {
        $fileName = str_replace('{country}', strtolower($helper->getConfigurationCountryCode()), $fileName);
        parent::__construct(
            $fileResolver,
            $converter,
            $schemaLocator,
            $validationState,
            $fileName,
            $idAttributes,
            $domDocumentClass,
            $defaultScope
        );
    }

    public function read($scope = null)
    {
        $scope = $scope ?: $this->_defaultScope;
        $fileList = $this->_fileResolver->get($this->_fileName, $scope);

        if (!count($fileList)) {
            return $this->_readFiles($this->_fileResolver->get('adminhtml/rules/payment_other.xml', $scope));
        }

        return $this->_readFiles($fileList);
    }
}