How Cashfree implemented one-time-passwords with Browserless

function evaluate(otp) {
  //Fill bank's input element with otp
  document.getElementsByClassName("optPass")[0].value = otp;
  //call validate function in the page
  ValidateForm();
}
const waitForResponse = function(page, badURL, goodURL = "cashfree.com") {
  return new Promise((resolve, reject) => {
    page.on("response", (response) => {
      let newUrl = response.url();
      if (newUrl.includes(badURL)) {
        return resolve(false);
      } else if (newUrl.includes(goodURL)) {
        return resolve(true);
      }
    });
  });
};
async function submitOTP(otp) {
  try {
    let browser = await puppeteer.connect({
      browserWSEndpoint: "internal/browserless/endpoint",
    });
    let page = await browser.newPage();
    let errorDialogMessage = "";

    //register event to capture alert dialog box
    page.on("dialog", async (dialog) => {
      errorDialogMessage = dialog.message();
      await dialog.dismiss();
      return errorDialogMessage;
    });
    //submit otp
    await page.evaluate(this.evaluate, otp);

    if (errorDialogMessage !== "") {
      return constants.RESPONSE_MSG_OTP_FAIL;
    }
    //check otp submission. If OTP is okay we will redirect to cashfree.com
    let output = await Promise.race([
      waitForResponse(page, "www.mybank.com/ajax/validate"),
      page.waitForSelector(".error", {
        visible: true
      }),
    ]);

    if (output === true) {
      return "OTP_OK";
    } else {
      return "OTP_INVALID";
    }
  } catch (err) {
    return "OTP_INVALID";
  }
}