CustomerGroupRetriever.php

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<?php
namespace Magento\Sales\Model;

use Magento\Backend\Model\Session\Quote;
use Magento\Customer\Api\GroupManagementInterface;

class CustomerGroupRetriever implements \Magento\Customer\Model\Group\RetrieverInterface
{
    private $quoteSession;

    private $groupManagement;

    public function __construct(Quote $quoteSession, GroupManagementInterface $groupManagement)
    {
        $this->quoteSession = $quoteSession;
        $this->groupManagement = $groupManagement;
    }

    public function getCustomerGroupId()
    {
        if ($this->quoteSession->getQuoteId() && $this->quoteSession->getQuote()) {
            return $this->quoteSession->getQuote()->getCustomerGroupId();
        }
        return $this->groupManagement->getNotLoggedInGroup()->getId();
    }
}