Free.php

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<?php
namespace Magento\Payment\Model\Method;

use Magento\Framework\Pricing\PriceCurrencyInterface;

class Free extends \Magento\Payment\Model\Method\AbstractMethod
{
    const PAYMENT_METHOD_FREE_CODE = 'free';

    const XML_PATH_PAYMENT_FREE_ACTIVE = 'payment/free/active';

    const XML_PATH_PAYMENT_FREE_ORDER_STATUS = 'payment/free/order_status';

    const XML_PATH_PAYMENT_FREE_PAYMENT_ACTION = 'payment/free/payment_action';

    protected $_canAuthorize = true;

    protected $_code = self::PAYMENT_METHOD_FREE_CODE;

    protected $priceCurrency;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Api\ExtensionAttributesFactory $extensionFactory,
        \Magento\Framework\Api\AttributeValueFactory $customAttributeFactory,
        \Magento\Payment\Helper\Data $paymentData,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Payment\Model\Method\Logger $logger,
        PriceCurrencyInterface $priceCurrency,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        parent::__construct(
            $context,
            $registry,
            $extensionFactory,
            $customAttributeFactory,
            $paymentData,
            $scopeConfig,
            $logger,
            $resource,
            $resourceCollection,
            $data
        );
        $this->priceCurrency = $priceCurrency;
    }

    public function isAvailable(\Magento\Quote\Api\Data\CartInterface $quote = null)
    {
        return parent::isAvailable(
            $quote
        ) && null !== $quote && $this->priceCurrency->round(
            $quote->getGrandTotal()
        ) == 0;
    }

    public function isAvailableInConfig($quote = null)
    {
        return parent::isAvailable($quote);
    }

    public function getConfigPaymentAction()
    {
        return $this->getConfigData('order_status') == 'pending' ? null : parent::getConfigPaymentAction();
    }
}