GuestPaymentInformationManagementPlugin.php

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<?php
namespace Magento\Persistent\Model\Checkout;

use Magento\Checkout\Model\GuestPaymentInformationManagement;
use Magento\Checkout\Model\Session;

class GuestPaymentInformationManagementPlugin
{
    private $persistenceSessionHelper;

    private $persistenceDataHelper;

    private $customerSession;

    private $checkoutSession;

    private $quoteManager;

    private $cartRepository;

    public function __construct(
        \Magento\Persistent\Helper\Data $persistenceDataHelper,
        \Magento\Persistent\Helper\Session $persistenceSessionHelper,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Persistent\Model\QuoteManager $quoteManager,
        \Magento\Quote\Api\CartRepositoryInterface $cartRepository
    ) {
        $this->persistenceDataHelper = $persistenceDataHelper;
        $this->persistenceSessionHelper = $persistenceSessionHelper;
        $this->customerSession = $customerSession;
        $this->checkoutSession = $checkoutSession;
        $this->quoteManager = $quoteManager;
        $this->cartRepository = $cartRepository;
    }

    public function beforeSavePaymentInformationAndPlaceOrder(
        GuestPaymentInformationManagement $subject,
        $cartId,
        $email,
        \Magento\Quote\Api\Data\PaymentInterface $paymentMethod,
        \Magento\Quote\Api\Data\AddressInterface $billingAddress = null
    ) {
        if ($this->persistenceSessionHelper->isPersistent()
            && !$this->customerSession->isLoggedIn()
            && $this->persistenceDataHelper->isShoppingCartPersist()
            && $this->quoteManager->isPersistent()
        ) {
            $this->customerSession->setCustomerId(null);
            $this->customerSession->setCustomerGroupId(null);
            $this->quoteManager->convertCustomerCartToGuest();
            $quote = $this->cartRepository->get($this->checkoutSession->getQuote()->getId());
            $quote->setCustomerEmail($email);
            $quote->getAddressesCollection()->walk('setEmail', ['email' => $email]);
            $this->cartRepository->save($quote);
        }
    }
}