Form.php

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<?php
namespace Magento\Paypal\Block\Express;

use Magento\Customer\Helper\Session\CurrentCustomer;
use Magento\Framework\Locale\ResolverInterface;
use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Magento\Paypal\Helper\Data;
use Magento\Paypal\Model\Config;
use Magento\Paypal\Model\ConfigFactory;
use Magento\Paypal\Model\Express\Checkout;

class Form extends \Magento\Payment\Block\Form
{
    protected $_methodCode = Config::METHOD_WPP_EXPRESS;

    protected $_paypalData;

    protected $_paypalConfigFactory;

    protected $_localeResolver;

    protected $_config;

    protected $_isScopePrivate;

    protected $currentCustomer;

    public function __construct(
        Context $context,
        ConfigFactory $paypalConfigFactory,
        ResolverInterface $localeResolver,
        Data $paypalData,
        CurrentCustomer $currentCustomer,
        array $data = []
    ) {
        $this->_paypalData = $paypalData;
        $this->_paypalConfigFactory = $paypalConfigFactory;
        $this->_localeResolver = $localeResolver;
        $this->_config = null;
        $this->_isScopePrivate = true;
        $this->currentCustomer = $currentCustomer;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->_config = $this->_paypalConfigFactory->create()
            ->setMethod($this->getMethodCode());
        $mark = $this->_getMarkTemplate();
        $mark->setPaymentAcceptanceMarkHref(
            $this->_config->getPaymentMarkWhatIsPaypalUrl($this->_localeResolver)
        )->setPaymentAcceptanceMarkSrc(
            $this->_config->getPaymentMarkImageUrl($this->_localeResolver->getLocale())
        );

        // known issue: code above will render only static mark image
        $this->_initializeRedirectTemplateWithMark($mark);
        parent::_construct();

        $this->setRedirectMessage(__('You will be redirected to the PayPal website.'));
    }

    public function getMethodCode()
    {
        return $this->_methodCode;
    }

    protected function _getMarkTemplate()
    {
        $mark = $this->_layout->createBlock(\Magento\Framework\View\Element\Template::class);
        $mark->setTemplate('Magento_Paypal::payment/mark.phtml');
        return $mark;
    }

    protected function _initializeRedirectTemplateWithMark(Template $mark)
    {
        $this->setTemplate(
            'Magento_Paypal::payment/redirect.phtml'
        )->setRedirectMessage(
            __('You will be redirected to the PayPal website when you place an order.')
        )->setMethodTitle(
            // Output PayPal mark, omit title
            ''
        )->setMethodLabelAfterHtml(
            $mark->toHtml()
        );
    }

    public function getBillingAgreementCode()
    {
        $customerId = $this->currentCustomer->getCustomerId();
        return $this->_paypalData->shouldAskToCreateBillingAgreement($this->_config, $customerId)
            ? Checkout::PAYMENT_INFO_TRANSPORT_BILLING_AGREEMENT
            : null;
    }
}