OrderPlace.php

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<?php
namespace Magento\Braintree\Model\Paypal\Helper;

use Magento\Quote\Model\Quote;
use Magento\Checkout\Helper\Data;
use Magento\Customer\Model\Group;
use Magento\Customer\Model\Session;
use Magento\Checkout\Model\Type\Onepage;
use Magento\Quote\Api\CartManagementInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Checkout\Api\AgreementsValidatorInterface;

class OrderPlace extends AbstractHelper
{
    private $cartManagement;

    private $agreementsValidator;

    private $customerSession;

    private $checkoutHelper;

    public function __construct(
        CartManagementInterface $cartManagement,
        AgreementsValidatorInterface $agreementsValidator,
        Session $customerSession,
        Data $checkoutHelper
    ) {
        $this->cartManagement = $cartManagement;
        $this->agreementsValidator = $agreementsValidator;
        $this->customerSession = $customerSession;
        $this->checkoutHelper = $checkoutHelper;
    }

    public function execute(Quote $quote, array $agreement)
    {
        if (!$this->agreementsValidator->isValid($agreement)) {
            throw new LocalizedException(__(
                "The order wasn't placed. First, agree to the terms and conditions, then try placing your order again."
            ));
        }

        if ($this->getCheckoutMethod($quote) === Onepage::METHOD_GUEST) {
            $this->prepareGuestQuote($quote);
        }

        $this->disabledQuoteAddressValidation($quote);

        $quote->collectTotals();
        $this->cartManagement->placeOrder($quote->getId());
    }

    private function getCheckoutMethod(Quote $quote)
    {
        if ($this->customerSession->isLoggedIn()) {
            return Onepage::METHOD_CUSTOMER;
        }
        if (!$quote->getCheckoutMethod()) {
            if ($this->checkoutHelper->isAllowedGuestCheckout($quote)) {
                $quote->setCheckoutMethod(Onepage::METHOD_GUEST);
            } else {
                $quote->setCheckoutMethod(Onepage::METHOD_REGISTER);
            }
        }

        return $quote->getCheckoutMethod();
    }

    private function prepareGuestQuote(Quote $quote)
    {
        $quote->setCustomerId(null)
            ->setCustomerEmail($quote->getBillingAddress()->getEmail())
            ->setCustomerIsGuest(true)
            ->setCustomerGroupId(Group::NOT_LOGGED_IN_ID);
    }
}