TotalMinMax.php

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

use Magento\Payment\Model\MethodInterface;
use Magento\Quote\Model\Quote;

class TotalMinMax implements SpecificationInterface
{
    const MIN_ORDER_TOTAL = 'min_order_total';

    const MAX_ORDER_TOTAL = 'max_order_total';

    public function isApplicable(MethodInterface $paymentMethod, Quote $quote)
    {
        $total = $quote->getBaseGrandTotal();
        $minTotal = $paymentMethod->getConfigData(self::MIN_ORDER_TOTAL);
        $maxTotal = $paymentMethod->getConfigData(self::MAX_ORDER_TOTAL);
        if (!empty($minTotal) && $total < $minTotal || !empty($maxTotal) && $total > $maxTotal) {
            return false;
        }
        return true;
    }
}