AddPaypalShortcuts.php

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<?php
namespace Magento\Braintree\Observer;

use Magento\Framework\Event\Observer;
use Magento\Catalog\Block\ShortcutButtons;
use Magento\Framework\Event\ObserverInterface;

class AddPaypalShortcuts implements ObserverInterface
{
    const PAYPAL_SHORTCUT_BLOCK = \Magento\Braintree\Block\Paypal\Button::class;

    public function execute(Observer $observer)
    {
        // Remove button from catalog pages
        if ($observer->getData('is_catalog_product')) {
            return;
        }

        $shortcutButtons = $observer->getEvent()->getContainer();

        $shortcut = $shortcutButtons->getLayout()->createBlock(self::PAYPAL_SHORTCUT_BLOCK);

        $shortcutButtons->addShortcut($shortcut);
    }
}