Quick start: Express

npm install express @gauge/support
export GAUGE_APP_ID=<app id> GAUGE_IDENTITY_SECRET=<identity secret> GAUGE_WEBHOOK_SECRET=<whsec_…>

import { mintIntegrationToken } from '@gauge/support';

export async function gaugeToken(req, res) {
  const token = await mintIntegrationToken(process.env.GAUGE_IDENTITY_SECRET, {
    appId: process.env.GAUGE_APP_ID,
    userId: String(req.user.id),
    integration: 'customer',
    name: req.user.name,
    email: req.user.email,
  });
  res.set('cache-control', 'no-store').json({ token });
}

<script src="https://widget.gauge.chat/v1/<version>/widget.js"
  integrity="sha384-<integrity>" crossorigin="anonymous" async></script>
<script>
  window.addEventListener('load', function () {
    window.PulseWebchat.init({
      apiUrl: 'https://app.gauge.chat/backend',
      connectionId: '<chat connection id>',
      supportMode: true,
      integration: 'customer',
      getToken: function () { // called on every open, so the token is always fresh
        return fetch('/gauge-token', { credentials: 'include' })
          .then(function (r) { return r.json(); })
          .then(function (j) { return j.token; });
      },
    });
  });
</script>

import { verifyWebhook } from '@gauge/support';

const handled = new Set(); // use your database in production: ids repeat on retries and resends

export async function gaugeWebhook(req, res) {
  const result = await verifyWebhook(process.env.GAUGE_WEBHOOK_SECRET, req.body, req.headers);
  if (!result.valid) return res.status(400).send(result.reason);
  const event = result.event;
  if (handled.has(event.id)) return res.sendStatus(200);
  handled.add(event.id);
  console.info('gauge', event.event, event.id, event.livemode ? 'live' : 'sandbox');
  // event.event is the type, event.payload the ids: e.g. push the user on support.chat.message_created
  res.sendStatus(200);
}

import express from 'express';
import { gaugeToken } from './gauge-token.js';
import { gaugeWebhook } from './gauge-webhook.js';

const app = express();
app.get('/gauge-token', requireLogin, gaugeToken);                                  // your auth
app.post('/gauge/webhooks', express.raw({ type: 'application/json' }), gaugeWebhook);
app.listen(3000);