Ogone\AbstractResponse::extractShaSign PHP Метод

    protected function extractShaSign(array $parameters)
    {
        if (!array_key_exists(self::SHASIGN_FIELD, $parameters) || $parameters[self::SHASIGN_FIELD] == '') {
            throw new InvalidArgumentException('SHASIGN parameter not present in parameters.');
        }
        return $parameters[self::SHASIGN_FIELD];
    }