public class WS_Birst_wwwBirstCom {
  public String Login(String username,String password) {
    WS_Birst_wwwBirstCom.Login_element request_x = new WS_Birst_wwwBirstCom.Login_element();
    request_x.username = username;
    request_x.password = password;
    WS_Birst_wwwBirstCom.LoginResponse_element response_x;
    Map<String, WS_Birst_wwwBirstCom.LoginResponse_element> response_map_x =
      new Map<String, WS_Birst_wwwBirstCom.LoginResponse_element>();
    response_map_x.put('response_x', response_x);
    WebServiceCallout.invoke(
          this,
          request_x,
          response_map_x,
          new String[]{endpoint_x,
          'http://www.birst.com/Login',
          'http://www.birst.com/',
          'Login',
          'http://www.birst.com/',
          'LoginResponse',
          'WS_Birst_wwwBirstCom.LoginResponse_element'}
        );
        response_x = response_map_x.get('response_x');
        return response_x.LoginResult;
    }
}

public void func()
{
    String username='username';
    String ssopassword='password';
    String response;
    WS_Birst_wwwBirstCom birstInstance = new WS_Birst_wwwBirstCom();
    token = birstInstance.Login(username, ssopassword);
}