Unable to fetch userinfo using access_token from auth0

I am trying to build a simple authentication library, and I am using axios instead of library built by auth0. I am unable to fetch the userdata using the access code. I am also using google provider for authentication.

import axios from 'axios'

export default class Auth {
    constructor(
        private domain: string,
        private client_id: string,
        private redirect_uri: string
    ) {}

    startAuthFlow(): string {
        const params = new URLSearchParams({
            response_type: 'code',
            client_id: this.client_id,
            redirect_uri: this.redirect_uri,
            scope: 'offline_access'
        })
        const authURI = `https://${this.domain}/authorize?${params.toString()}`
        return authURI
    }

    async handleCallback(code: string) {
        return await this.exchangeCodeForToken(code)
    }

    async getUserInfo(accessToken: string) {
        const userInfoEndpoint = `https://${this.domain}/userinfo`
        try {
            const response = await axios.get(userInfoEndpoint, {
                params: {
                    scope: "openid profile email"
                },
                headers: {
                    Authorization: `Bearer ${accessToken}`
                }
            })
            return response.data
        } catch (error) {
            throw error
        }
    }

    async refreshToken(refresh_token: string) {
        const tokenEndpoint = `https://${this.domain}/oauth/token`
        const payload = {
            grant_type: 'refresh_token',
            client_id: this.client_id,
            refresh_token
        }
        try {
            const response = await axios.post(tokenEndpoint, payload, {
                headers: {
                    'Content-Type': 'application/json'
                }
            })
            return response.data
        } catch (error) {
            throw error
        }
    }

    private async exchangeCodeForToken(code: string) {
        const tokenEndPoint = `https://${this.domain}/oauth/token`
        const payload = {
            grant_type: 'authorization_code',
            client_id: this.client_id,
            client_secret: 'B60OCXAoe7KqIkwLTqHeDlLBMFYtMh6kLw7WAXJl0qCMXDyJzROHyAJr449LKXz9',
            code,
            redirect_uri: this.redirect_uri,
            scope: 'openid profile email'
        }
        try {
            const reponse = await axios.post(tokenEndPoint, payload)
            const { access_token, id_token, refresh_token } = reponse.data
            return { access_token, id_token, refresh_token }
        } catch (error) {
            throw error
        }
    }
}

I am using this library in a express application to test it.

const express = require('express')
const Auth = require('../auth').default
const auth = new Auth('dev-k2t4k3888k1ic1rm.us.auth0.com', 'Zg2GuO5NfJMFVbZsbRVn8naqFUJNKZdU', 'http://localhost:3000/callback')

const app = new express()

app.get('/', (req,res) => {
    return res.send('Hello')
})

app.get('/login', (req, res) => {
    res.redirect(auth.startAuthFlow())
})

app.get('/callback', async (req, res) => {
    const { code } = req.query
    try {
        const { access_token } = await auth.handleCallback(code)
        console.log(access_token)
        const user = await auth.getUserInfo(access_token)
        console.log("USER: ", user)

        res.redirect('/')
    } catch (error) {
        console.log(error)
        return res.status(404).send(error)
    }
})

app.listen(3000, () => {
    console.log('Server running on port 3000')
})

Can anyone help me why I am not able to fetch the user data? I can see the userdata in my auth0 dashboard