/**
 * Payment code.
 *
 * @var string
 */
protected $_code = 'ced_braintree';

protected $request;
protected $_canAuthorize = true;
protected $_canCapture = true;
protected $_canUseInternal = false;
protected $_logger;
protected $_catalogSession;

public function __construct(
    MagentoFrameworkModelContext $context,
    MagentoFrameworkApiExtensionAttributesFactory $extensionFactory,
    MagentoFrameworkApiAttributeValueFactory $customAttributeFactory,
    MagentoPaymentHelperData $paymentData,
    MagentoFrameworkAppConfigScopeConfigInterface $scopeConfig,
    MagentoPaymentModelMethodLogger $logger,
    array $data = []
) {
    parent::__construct(
        $context,
        $registry,
        $extensionFactory,
        $customAttributeFactory,
        $paymentData,
        $scopeConfig,
        $logger,
        null,
        null,
        $data
    );

}

public function assignData(DataObject $data)
{
      print_r($data);die;
     //getting null value of card number,exp date and cvv
    if (!($data instanceof DataObject)) {
        $data = new DataObject($data);
    }
    $Cardinfo = $this->getInfoInstance();
    $Cardinfo->setCcType($data['additional_data']['cc_type'])
        ->setCcLast4(substr($data['additional_data']['cc_number'], -4))
        ->setCcNumber($data['additional_data']['cc_number'])
        ->setCcCid($data['additional_data']['cc_cid'])
        ->setCcExpMonth($data['additional_data']['cc_exp_month'])
        ->setCcExpYear($data['additional_data']['cc_exp_year']);

    return $this;
}