PayflowProAddCcData.php

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<?php
namespace Magento\Paypal\Observer;

use Magento\Framework\Event\Observer;
use Magento\Payment\Observer\AbstractDataAssignObserver;
use Magento\Paypal\Model\Payflow\Transparent;
use Magento\Quote\Api\Data\PaymentInterface;

class PayflowProAddCcData extends AbstractDataAssignObserver
{
    private $ccKeys = [
        'cc_type',
        'cc_exp_year',
        'cc_exp_month',
        'cc_last_4'
    ];

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $dataObject = $this->readDataArgument($observer);

        $additionalData = $dataObject->getData(PaymentInterface::KEY_ADDITIONAL_DATA);

        if (!is_array($additionalData)) {
            return;
        }

        $ccData = array_intersect_key($additionalData, array_flip($this->ccKeys));
        if (count($ccData) !== count($this->ccKeys)) {
            return;
        }
        $paymentModel = $this->readPaymentModelArgument($observer);

        $paymentModel->setAdditionalInformation(
            Transparent::CC_DETAILS,
            $this->sortCcData($ccData)
        );

        // CC data should be stored explicitly
        foreach ($ccData as $ccKey => $ccValue) {
            $paymentModel->setData($ccKey, $ccValue);
        }
    }

    private function sortCcData(array $ccData)
    {
        $r = [];
        foreach ($this->ccKeys as $key) {
            $r[$key] = isset($ccData[$key]) ? $ccData[$key] : null;
        }

        return $r;
    }
}