PayPal\Core\PayPalHttpConfig::__construct PHP Method

    public function __construct($url = null, $method = self::HTTP_POST, $configs = array())
    {
        $this->url = $url;
        $this->method = $method;
        $this->curlOptions = $this->getHttpConstantsFromConfigs($configs, 'http.') + self::$defaultCurlOptions;
        // Update the Cipher List based on OpenSSL or NSS settings
        $curl = curl_version();
        $sslVersion = isset($curl['ssl_version']) ? $curl['ssl_version'] : '';
        if ($sslVersion && substr_compare($sslVersion, "NSS/", 0, strlen("NSS/")) === 0) {
            //Remove the Cipher List for NSS
            $this->removeCurlOption(CURLOPT_SSL_CIPHER_LIST);
        }
    }