zapier oauth2 giving error for access_token - oauth-2.0

Question

Hi i am trying to implement oauth2 with Zapier platform, and i am facing some error.
I just have a testing node.js app where i am login request from zapier platform.
const express = require('express');
const jwt = require('jsonwebtoken');
const uuidv4 = require('uuid/v4');
const app = express();
const port = process.env.PORT || 3000;
let count = 0;
// const redirect url = https://zapier.com/dashboard/auth/oauth/return/App77581CLIAPI/
app.get('/', (req, res) => res.json({
count
}));
app.post('/zapier', (req, res) => {
count++;
res.json({
count
})
})
app.get('/api/login', (req, res) => {
// console.log('req', req);
const { state } = req.query;
// const state = 1578212496.13945431311;
console.log(state);
const user = {
name: "ankit",
id: 12344
}
const token = jwt.sign(user, "luciferTonify");
const code = uuidv4();
res.redirect(`https://zapier.com/dashboard/auth/oauth/return/App77581CLIAPI?code=${code}&state=${state}&access_token=${code}&token_type=bearer`);
})
app.post('/api/login', (req, res) => {
const user = {
name: "ankit",
id: 12344
}
const token = jwt.sign(user, "luciferTonify");
res.json({ token });
});
function verifyToken(req, res, next) {
const { authorization: token } = req.headers;
if (typeof token == 'undefined' || !token) {
req.token = token;
next();
} else {
res.sendStatus(403);
}
}
app.listen(port, () => console.log(`Example app listening on port ${port}!`))
its just a testing app, so i am trying to send an access_token, but zapier is giving me this error
**
Zapier could not connect to your account. Field named access_token
not found in OAuth2 results
**
?
can anyone help me what i am doing wrong ?