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Unified Passport
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Unified Passport: Unblock the Traffic Flow
"The best experience is: I log in on Site A, and I am still logged in on Site B."
What you will get in this chapter
- A minimum viable SSO system (MVS)
- Unified account SOP
- Key metrics and acceptance criteria
One-sentence definition
Unified passport = single sign-on + unified identity + cross-site session.
It turns the matrix from "islands" into a "galaxy".
Minimum viable SSO system (MVS)
| Step | You need | Acceptance result |
|---|---|---|
| Unified account | One auth center | Identity shared across sites |
| Session sharing | Cross-domain cookie/token | No repeated login |
| User profile | Basic profile | Synced across sites |
Qualified signal: users can move from A to B without logging in again.
Unified passport SOP (standard process)
- Build auth center: main domain handles login
- Configure satellites: sub-sites as controlled domains
- Share sessions: cross-domain token/session
- Unify profile: avatar/subscription/permission sync
- Permission tiers: one account controls multiple products
Common implementation forms
- Centralized auth: one main domain handles all logins
- Token distribution: after login, tokens are issued to sub-sites
- Unified profile: user profile and subscriptions stay consistent
Principle: one login, access everywhere.
Core metrics (must track)
Definition (default):
- Time window: unless stated otherwise, use the last 7 days rolling.
- Data source: use one trusted source (GA4/GSC/platform console/logs) and keep it consistent.
- Scope: only the current product/channel, exclude self-tests and bots.
| Metric | Meaning | Pass line |
|---|---|---|
| SSO Success Rate | SSO success rate | >= 98% |
| Cross-App Activation | Activation from Site A to Site B | >= 10% |
| Login Drop-off | Login page drop-off | <= 20% |
| Session Latency | Cross-site session time | <= 2 seconds |
Acceptance checklist
After logging in on the main site, sub-sites recognize identity
User profile and subscriptions sync across sites
Cross-domain session time <= 2 seconds
Common mistakes
- Accounts not unified -> users register repeatedly
- Cross-domain cookie misconfig -> SSO fails
- Permission chaos -> user experience collapses
Community case addendum (from developer communities)
The following are public community shares. Metrics are self-reported or taken from public pages and are not independently verified:
- HN: sso.tax aggregates vendors that charge for SSO and sparked discussion. The page shows 288 points and 191 comments, reflecting strong demand for SSO experience; it highlights that unified access is key for conversion and retention. Link: https://news.ycombinator.com/item?id=44955457
Summary
Key takeaways
1. Unified passport is the prerequisite for cross-promotion.
2. SSO success rate must be near 100%.
3. The earlier you unify accounts, the lower the migration cost.
Next chapter, we will cover the Cross-Promotion Engine -- let traffic circulate inside the matrix.