Migrate from GeeTest to CaptchaLa

<div id="captcha"></div>
<script src="https://static.geetest.com/v4/gt4.js"></script>
<script>
  initGeetest4({ captchaId: 'YOUR_CAPTCHA_ID' }, function(captcha) {
    captcha.appendTo('#captcha')
    captcha.onSuccess(function() {
      var result = captcha.getValidate()
      document.getElementById('lot_number').value = result.lot_number
      document.getElementById('captcha_output').value = result.captcha_output
      document.getElementById('pass_token').value = result.pass_token
      document.getElementById('gen_time').value = result.gen_time
    })
  })
</script>

<div class="captchala" data-app-key="YOUR_APP_KEY"></div>
<script src="https://cdn.captcha.la/v1/captchala.js" async defer></script>

const sign = crypto.createHmac('sha256', process.env.GEETEST_KEY)
  .update(req.body.lot_number).digest('hex')
const res = await fetch(`https://gcaptcha4.geetest.com/validate?captcha_id=${process.env.GEETEST_ID}`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
  body: new URLSearchParams({
    lot_number: req.body.lot_number,
    captcha_output: req.body.captcha_output,
    pass_token: req.body.pass_token,
    gen_time: req.body.gen_time,
    sign_token: sign,
  }),
})
const data = await res.json()
if (data.result !== 'success') return res.status(400).json({ error: 'bot' })

const res = await fetch('https://api.captcha.la/v1/verify', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    appSecret: process.env.CAPTCHALA_SECRET,
    token: req.body['captchala-token'],
  }),
})
const data = await res.json()
if (!data.success) return res.status(400).json({ error: 'bot' })