Auth0 NextJS integration advise

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Hello, community. I would like to ask for advice on my implementation of Auth0 using NextJS. The project goal is to develop 2 features:

  • A. User link accounts
  • B. Make requests to Linkedin Ads API

I am using @auth0/nextjs-auth0

Here are the functions I wrote to get the mgmt API access token getAccessToken and how I get the idp (identity provider) access token required to make API requests

import { getSession } from "@auth0/nextjs-auth0"
import { NextApiRequest, NextApiResponse } from "next"

export const getAccessToken = async () => {
    const tokenRequest = await fetch(`https://asasvirtuais.us.auth0.com/oauth/token`, {
        method: 'POST',
        body: `{"client_id":"${
            process.env.AUTH0_CLIENT_ID
        }","client_secret":"${
            process.env.AUTH0_CLIENT_SECRET
        }","audience":"https://asasvirtuais.us.auth0.com/api/v2/","grant_type":"client_credentials"}`,
        headers: {'content-type': 'application/json'},
    }).then( res => res.json() )
    const token = tokenRequest.access_token
    if ( ! token )
        throw new Error('Unable to retrieve access token')
    return token
}

export const getIdPToken = async ( req: NextApiRequest, res: NextApiResponse, idp: string ) : Promise<string | null> => {
    const session = await getSession(req, res)
    const id = session?.user?.sub as string
    const token = await getAccessToken()
    const user = await fetch(`https://asasvirtuais.us.auth0.com/api/v2/users/${id}`, {
        headers: {
            authorization: `Bearer ${token}`
        }
    }).then( res => res.json() )
    return user.identities.find( (i: any) => i.provider === idp )?.access_token
}