public function get_session_auth($username,$password){
        $resultArray = array(
            'result' => 'succeeded',
            'resultText' => null
        );

        $request = new HTTP_Request2($this->baseUrl. 'index.php/login/get_session_id_via_login?username='.$username.'&password='.$password, HTTP_Request2::METHOD_GET);
        if (ENVIRONMENT === 'development') {
            $request->setConfig(array('ssl_verify_peer' => false));
        }
        //$request->setAdapter('curl');
        try {
            $response = $request->send();
            if (200 == $response->getStatus()) {
                $resultArray = json_decode($response->getBody(), true);
            } else {
                $resultArray['result'] = 'failed';
                $resultArray['resultText'] = 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
                $response->getReasonPhrase();
                // Here we should write data to log file.
                $this->getLogger()->error($resultArray['resultText']);
            }
        } catch (HTTP_Request2_Exception $e) {
            $resultArray['result'] = 'failed';
            $resultArray['resultText'] = 'Error: ' . $e->getMessage();
            // Here we should write data to log file.
            $this->getLogger()->error($resultArray['resultText']);
        }
        $resultArray['operation_name'] = 'get_session_auth';
        return $resultArray;
    }

$session_id = session_id();
return $session_id;

public function dosomething($session_id)
    {
        $resultArray = array(
            'result' => 'succeeded',
            'resultText' => null
        );

        $request = new HTTP_Request2($this->baseUrl. 'index.php/payment/dosomething/true?session_id='.$session_id, HTTP_Request2::METHOD_GET);
        if (ENVIRONMENT === 'development') {
            $request->setConfig(array('ssl_verify_peer' => false));
        }
        //$request->setAdapter('curl');
        try {
            $response = $request->send();
            if (200 == $response->getStatus()) {
                $resultArray = json_decode($response->getBody(), true);
            } else {
                $resultArray['result'] = 'failed';
                $resultArray['resultText'] = 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
                $response->getReasonPhrase();
                // Here we should write data to log file.
                $this->getLogger()->error($resultArray['resultText']);
            }
        } catch (HTTP_Request2_Exception $e) {
            $resultArray['result'] = 'failed';
            $resultArray['resultText'] = 'Error: ' . $e->getMessage();
            // Here we should write data to log file.
            $this->getLogger()->error($resultArray['resultText']);
        }
        $resultArray['operation_name'] = 'dosomething';
        return $resultArray;
    }

session_id( 'session_id' );
session_start();