Watch a Gmail inbox for new messages (push, not polling)

domain: google-gmail · 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

Create a Pub/Sub topic; grant gmail-api-push@system.gserviceaccount.com publisher rights
POST /gmail/v1/users/me/watch with topicName and labelIds=['INBOX']
On each Pub/Sub push, call history.list with the stored historyId to get changes
Renew the watch every <7 days (it expires)

Known gotchas

watch expires after 7 days max — set a daily renewal cron or pushes silently stop
historyId gaps (404 on history.list) mean you waited too long — fall back to full messages.list sync
Pub/Sub push endpoint must be a verified HTTPS endpoint or in the same GCP project

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