RiskDataHandler.php

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<?php
namespace Magento\Braintree\Gateway\Response;

use Magento\Payment\Gateway\Helper\ContextHelper;
use Magento\Braintree\Gateway\SubjectReader;
use Magento\Payment\Gateway\Response\HandlerInterface;

class RiskDataHandler implements HandlerInterface
{
    const RISK_DATA_ID = 'riskDataId';

    const RISK_DATA_DECISION = 'riskDataDecision';

    private static $statusReview = 'Review';

    private $subjectReader;

    public function __construct(SubjectReader $subjectReader)
    {
        $this->subjectReader = $subjectReader;
    }

    public function handle(array $handlingSubject, array $response)
    {
        $paymentDO = $this->subjectReader->readPayment($handlingSubject);

        $transaction = $this->subjectReader->readTransaction($response);

        if (!isset($transaction->riskData)) {
            return;
        }

        $payment = $paymentDO->getPayment();
        ContextHelper::assertOrderPayment($payment);

        $payment->setAdditionalInformation(self::RISK_DATA_ID, $transaction->riskData->id);
        $payment->setAdditionalInformation(self::RISK_DATA_DECISION, $transaction->riskData->decision);

        // mark payment as fraud
        if ($transaction->riskData->decision === self::$statusReview) {
            $payment->setIsFraudDetected(true);
        }
    }
}