Thank you, Darwin! In my case, I was the person who created my OAuth credentials using the GCP console. My customers (advertisers) only can have their Google account and Google Ads account.
I kinda figured it out and it seems to work for my case. Here's the code snippet (see below). I'm using Node.js (Express.js), btw. The idea is that when the users hit a specific URL, it's supposed to call googleoauth function defined in the handler object. const { google } = require('googleapis'); const { GoogleAdsApi } = require('google-ads-api'); let oauth2Client; const handler = { googleoauth: async (req, res) => { // if no code parameter, then this is an initial login, so redirect to Google OAuth if (!req.query.code) { oauth2Client = new google.auth.OAuth2( '<CLIENT-ID>', '<CLIENT-SECRET>', '<REDIRECT-URI>' ); const url = oauth2Client.generateAuthUrl({ access_type: 'offline', prompt: 'consent', scope: 'https://www.googleapis.com/auth/adwords' }); res.redirect(url); } //redirect with access code from Google OAuth else { const { tokens } = await oauth2Client.getToken(req.query.code); oauth2Client.credentials = tokens; const client = new GoogleAdsApi({ client_id: '<CLIENT-ID>', client_secret: '<CLIENT-SECRET>', developer_token: '<DEVELOPER-TOKEN>' }); const customers = await client.listAccessibleCustomers(tokens.refresh_token); return res.json(customers); } } }; exports.handler = handler; -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "Google Ads API and AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/CAFLJBYBs3kpZBf3rgDHGvcVYQqGgSSW485kvTx4QYOJUD5jGSQ%40mail.gmail.com.