Button.php

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

use Magento\Braintree\Gateway\Config\PayPal\Config;
use Magento\Braintree\Model\Ui\ConfigProvider;
use Magento\Catalog\Block\ShortcutInterface;
use Magento\Checkout\Model\Session;
use Magento\Framework\Locale\ResolverInterface;
use Magento\Framework\View\Element\Template;
use Magento\Framework\View\Element\Template\Context;
use Magento\Payment\Model\MethodInterface;

class Button extends Template implements ShortcutInterface
{
    const ALIAS_ELEMENT_INDEX = 'alias';

    const BUTTON_ELEMENT_INDEX = 'button_id';

    private $localeResolver;

    private $checkoutSession;

    private $config;

    private $configProvider;

    private $payment;

    public function __construct(
        Context $context,
        ResolverInterface $localeResolver,
        Session $checkoutSession,
        Config $config,
        ConfigProvider $configProvider,
        MethodInterface $payment,
        array $data = []
    ) {
        parent::__construct($context, $data);

        $this->localeResolver = $localeResolver;
        $this->checkoutSession = $checkoutSession;
        $this->config = $config;
        $this->configProvider = $configProvider;
        $this->payment = $payment;
    }

    protected function _toHtml()
    {
        if ($this->isActive()) {
            return parent::_toHtml();
        }

        return '';
    }

    public function getAlias()
    {
        return $this->getData(self::ALIAS_ELEMENT_INDEX);
    }

    public function getContainerId()
    {
        return $this->getData(self::BUTTON_ELEMENT_INDEX);
    }

    public function getLocale()
    {
        return $this->localeResolver->getLocale();
    }

    public function getCurrency()
    {
        return $this->checkoutSession->getQuote()->getCurrency()->getBaseCurrencyCode();
    }

    public function getAmount()
    {
        return $this->checkoutSession->getQuote()->getBaseGrandTotal();
    }

    public function isActive()
    {
        return $this->payment->isAvailable($this->checkoutSession->getQuote()) &&
            $this->config->isDisplayShoppingCart();
    }

    public function getMerchantName()
    {
        return $this->config->getMerchantName();
    }

    public function getClientToken()
    {
        return $this->configProvider->getClientToken();
    }

    public function getActionSuccess()
    {
        return $this->getUrl(ConfigProvider::CODE . '/paypal/review', ['_secure' => true]);
    }
}