CheckoutValidator.php

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<?php
namespace Magento\Paypal\Helper\Shortcut;

class CheckoutValidator implements ValidatorInterface
{
    private $_checkoutSession;

    private $_paymentData;

    private $_shortcutValidator;

    public function __construct(
        \Magento\Checkout\Model\Session $checkoutSession,
        Validator $shortcutValidator,
        \Magento\Payment\Helper\Data $paymentData
    ) {
        $this->_checkoutSession = $checkoutSession;
        $this->_paymentData = $paymentData;
        $this->_shortcutValidator = $shortcutValidator;
    }

    public function validate($code, $isInCatalog)
    {
        return $this->_shortcutValidator->isContextAvailable($code, $isInCatalog)
            && $this->_shortcutValidator->isPriceOrSetAvailable($isInCatalog)
            && $this->isMethodQuoteAvailable($code, $isInCatalog)
            && $this->isQuoteSummaryValid($isInCatalog);
    }

    public function isMethodQuoteAvailable($paymentCode, $isInCatalog)
    {
        $quote = $isInCatalog ? null : $this->_checkoutSession->getQuote();
        // check payment method availability
        $methodInstance = $this->_paymentData->getMethodInstance($paymentCode);
        if (!$methodInstance->isAvailable($quote)) {
            return false;
        }
        return true;
    }

    public function isQuoteSummaryValid($isInCatalog)
    {
        $quote = $isInCatalog ? null : $this->_checkoutSession->getQuote();
        // validate minimum quote amount and validate quote for zero grandtotal
        if (null !== $quote && (!$quote->validateMinimumAmount() || !$quote->getGrandTotal())) {
            return false;
        }
        return true;
    }
}