Changelog & Engineering Notes

Notes from the access layer. Architecture deep-dives, API releases, and economics of short-term access.

Announcements

May 12, 2026·6 min read

Introducing Passyn: the infrastructure layer for short-term access

Why we believe the next decade of digital commerce belongs to flexible access — and how Passyn makes day passes, exam passes and project passes a first-class product for any business.

Engineering

May 28, 2026·9 min read

Designing an access engine you can put on a turnstile

Lazy expiry, idempotent activation and usage counting — the engineering decisions behind sub-40ms pass verification at the edge of the physical world.

Access economy

Jun 4, 2026·7 min read

The 95% problem: serving the customers who will never subscribe

Subscription conversion has a ceiling. We analyzed how merchants using short-term passes captured revenue from visitors their monthly tiers were structurally unable to convert.