Converter.php

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<?php
namespace Magento\Integration\Model\Config\Integration;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    const API_RESOURCES = 'resource';

    const API_RESOURCE_NAME = 'name';

    public function convert($source)
    {
        $result = [];
        $integrations = $source->getElementsByTagName('integration');
        foreach ($integrations as $integration) {
            if ($integration->nodeType != XML_ELEMENT_NODE) {
                continue;
            }
            $integrationName = $integration->attributes->getNamedItem('name')->nodeValue;
            $result[$integrationName] = [];
            $result[$integrationName][self::API_RESOURCES] = [];
            $resources = $integration->getElementsByTagName('resource');
            foreach ($resources as $resource) {
                if ($resource->nodeType != XML_ELEMENT_NODE) {
                    continue;
                }
                $resource = $resource->attributes->getNamedItem('name')->nodeValue;
                $result[$integrationName][self::API_RESOURCES][] = $resource;
            }
        }
        return $result;
    }
}