pop-up handle

package BrowserStack;

import io.appium.java_client.ios.IOSDriver;
import org.openqa.selenium.By;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.annotations.AfterTest;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.TimeUnit;


public class iOSTab {

    public IOSDriver driver;

    public WebDriverWait wait;
    public static String AUTOMATE_USERNAME = "username";
    public static String AUTOMATE_ACCESS_KEY = "accesskey";
    public static final String URL = "https://" + AUTOMATE_USERNAME + ":" + AUTOMATE_ACCESS_KEY + "@hub-cloud.browserstack.com/wd/hub";


    @BeforeClass
    public void setup() throws MalformedURLException {
        DesiredCapabilities caps = new DesiredCapabilities();
        caps.setCapability("os_version", "14");
        caps.setCapability("device", "iPhone 12");
        caps.setCapability("real_mobile", "true");
        caps.setCapability("browserstack.appium_version", "1.20.2");
        caps.setCapability("browserstack.local", "false");
        caps.setCapability("safariAllowPopups", "true");
          caps.setCapability("autoAcceptAlerts","true");
        driver = new IOSDriver(new URL(URL), caps);
        driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS) ;
    }


    @Test
    public void display() throws InterruptedException {
        wait = new WebDriverWait(driver, 30);
        driver.get("https://euwa-dev.azurewebsites.net/?customerKey=14004&configId=efad4ae4-2552-4c34-94f8-fb34bc7af604");
        driver.findElement(By.xpath("//button[@aria-label='Start Chat']")).click();
        String code = wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath("//span[@class='code']"))).getText();
        System.out.println(code);
        driver.findElement(By.xpath("//input[@type='number']")).sendKeys(code);
        driver.findElement(By.xpath("//button[@type='submit']")).click();
        wait.until(ExpectedConditions.elementToBeClickable(By.xpath("//button[@aria-label='Close chat']"))).click();
        Thread.sleep(10000);
    }


    @AfterTest
    public void destroy() {
        driver.quit();
    }

}