DescriptorDataBuilder.php

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

use Magento\Braintree\Gateway\SubjectReader;
use Magento\Payment\Gateway\Request\BuilderInterface;
use Magento\Braintree\Gateway\Config\Config;

class DescriptorDataBuilder implements BuilderInterface
{
    private static $descriptorKey = 'descriptor';

    private $config;

    private $subjectReader;

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

    public function build(array $buildSubject)
    {
        $paymentDO = $this->subjectReader->readPayment($buildSubject);
        $order = $paymentDO->getOrder();

        $values = $this->config->getDynamicDescriptors($order->getStoreId());
        return !empty($values) ? [self::$descriptorKey => $values] : [];
    }
}