CcType.php

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<?php
namespace Magento\Braintree\Helper;

use Magento\Braintree\Model\Adminhtml\Source\CcType as CcTypeSource;

class CcType
{
    private $ccTypes = [];

    private $ccTypeSource;

    public function __construct(CcTypeSource $ccTypeSource)
    {
        $this->ccTypeSource = $ccTypeSource;
    }

    public function getCcTypes()
    {
        if (!$this->ccTypes) {
            $this->ccTypes = $this->ccTypeSource->toOptionArray();
        }
        return $this->ccTypes;
    }
}