Node.js Express Login with PayPal Integration (ES6)

index.hbs

<h1>Paypal Login</h1>

<a href="{{paypalLoginUrl}}"><img src="https://www.paypalobjects.com/webstatic/en_US/developer/docs/lipp/loginwithpaypalbutton.png" /></a>

index.js

var app = require('express')();
var pp = require('paypalWrapper');

app.get('/', (req,res,next) => { 
  res.render('index',{paypalLoginUrl:pp.herlpers.getLoginUrl()});
});

app.get('/auth/paypal/callback', pp.handlers.handleAuthCallback);

paypalWrapper.js

var paypal = require('paypal-rest-sdk')

paypal.configure({
  'mode': config.auth.paypal.mode,
  'client_id': config.auth.paypal.clientID,
  'client_secret': config.auth.paypal.clientSecret,
  'openid_client_id': config.auth.paypal.clientID,
  'openid_client_secret': config.auth.paypal.clientSecret,
  'openid_redirect_uri': `${config.auth.oAuth.callbackHost}/auth/paypal/callback`
});

module.exports = {
  helpers: {
    getLoginUrl() {
      //-- you'll have to configure express sessions scope might look like 'openid profile email'
      return paypal.openIdConnect.authorizeUrl({'scope': config.auth.paypal.scope});
    }
  },
  handlers: {
    handleAuthCallback(req,res,next) {
      var authCode = req.query.code;
      var openIdConnect = paypal.openIdConnect;
      openIdConnect.tokeninfo.create(authCode, function (e, tokeninfo) {
        if (e) return next(e);
        paypal.openIdConnect.userinfo.get(tokeninfo.access_token, function (ee, userinfo) {
          if (e) return next(e);
          
          //-- Got it, now do what you need to
          console.log(tokeninfo);
          console.log(userinfo);

        next()
      });
    }
  }
}