Capture the oatuth 2 Access_token from jmeter using webdriver

JMeter-oauth2.groovy

import org.openqa.selenium.By
import org.openqa.selenium.JavascriptExecutor
import org.openqa.selenium.support.ui.FluentWait
import org.openqa.selenium.support.ui.Wait
import org.openqa.selenium.WebDriver
import org.openqa.selenium.WebElement
import org.openqa.selenium.support.ui.ExpectedConditions as EC
import java.time.Duration

try {
    WDS.sampleResult.sampleStart(); //captures sampler's start time
    WDS.sampleResult.getLatency();
    WDS.log.info("Sample started");

    // Launch website specified in 'URL'
    WDS.browser.get('http://pt-app.bankopen.co/');
    WDS.log.info("Sample ended - navigated to URL");

    // Wait for the username element to be present
    def wait = new FluentWait<WebDriver>(WDS.browser)
        .pollingEvery(Duration.ofMillis(500))
        .withTimeout(Duration.ofSeconds(10))
        .ignoring(org.openqa.selenium.NoSuchElementException)

    def usernameElementId = 'mat-input-0'
    WebElement usernameElement = wait.until {
        WDS.browser.findElement(By.id(usernameElementId))
    }

    // Enter username
    usernameElement.sendKeys('USERNAME')

    // Wait for the password element to be present
    def passwordElementId = 'mat-input-1'
    WebElement passwordElement = wait.until {
        WDS.browser.findElement(By.id(passwordElementId))
    }

    // Enter password
    passwordElement.sendKeys('PASSWORD')

    // Wait for the login button to be present
    def loginButtonSelector = 'button[flat-button][color="primary"]'
    WebElement loginButton = wait.until {
        WDS.browser.findElement(By.cssSelector(loginButtonSelector))
    }

    // Click the login button
    loginButton.click()

    // Wait for the "Dashboard" text element to be present
    def dashboardTextSelector = 'span.text-primary.font-semibold.ng-star-inserted'
    wait.until(EC.presenceOfElementLocated(By.cssSelector(dashboardTextSelector)))

    // Extract the access_token using JavaScriptExecutor
    def jsExecutor = (JavascriptExecutor) WDS.browser
    def accessTokenScript = """
        var accessToken = window.localStorage.getItem('_t');
        return accessToken;
    """
    def accessToken = jsExecutor.executeScript(accessTokenScript)

    // Store the access_token in a JMeter variable
    if (accessToken != null && accessToken.trim() != "") {
        org.apache.jmeter.threads.JMeterContextService.getContext().getVariables().put("access_token", accessToken)
        WDS.log.info("access_token: " + accessToken)
        WDS.log.info("access_token stored in JMeter variable 'access_token'")
    } else {
        WDS.log.error("access_token not found or empty.")
        WDS.sampleResult.setSuccessful(false)
    }

    WDS.sampleResult.setSuccessful(true)
} catch (Exception ex) {
    WDS.log.error("Error occurred: " + ex.getMessage())
    WDS.sampleResult.setSuccessful(false)
}