How to set up refresh-token-only OAuth for a multi-tenant Apify Actor (Gmail, 10 minutes)

If you're shipping an Apify Actor that calls a per-user Google API (Gmail, Calendar, Drive) and you want the simplest auth model that works for cold strangers, this is the setup.

The pattern: the buyer pastes three strings — refresh_token, client_id, client_secret — into the Actor input. The Actor exchanges them for a short-lived access token at runtime, hits the API, exits. No mailbox cache, no per-user OAuth callback URL, no Apify-side identity storage.

You can finish this in 10 minutes including the Google Cloud setup. I'll show the working version end-to-end. This is the actual pattern I'm running in production on apify.com/foxck/gmail-inbox-intel.

Step 1 — Google Cloud setup (5 min)

1. Open (MIT). The Actor lives at is open.
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