Architecture · September 2026 · 6 min read
Building Passwordless Customer Portals with Next.js and Supabase
Customers hate creating usernames and passwords to check the status of a one-time service job. Here is how to build secure, magic-link and token-based customer portals that delight clients.
The Friction of Customer Account Creation
Forcing a homeowner to register an account, create an 8-character password, and verify an email just to see their estimate causes 40% of clients to abandon the portal and call your office instead.
Modern service portals should be completely passwordless, relying on secure cryptographically signed tokens sent via SMS.
Token-Based Architecture
When an estimate is ready, the customer receives a private link containing a signed HMAC token: `https://yourdomain.com/portal/job-123?token=...`. The link grants instant access to view photos, sign proposals, and pay invoices with Apple Pay in 10 seconds.
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