The MDS Extension Server grew into a dedicated platform for licensing, extension distribution, update checks, billing, and portal-based account management. Earlier versions handled extension and license administration directly; later Go-based work pushed it toward a more complete operational platform with better boundaries between portal identity, billing, downloads, and admin tooling.
The work spans Stripe billing flows, customer entitlements, downloadable package delivery, subscription-state reconciliation, admin dashboards, customer self-service surfaces, and the surrounding runtime/deployment concerns needed to keep a software-delivery platform maintainable.
It is also a good example of evolving product infrastructure instead of only shipping features. Shared data directories, local-vs-Docker development flows, adaptive rate limiting, portal/account concerns, and operational tooling all had to cooperate without collapsing into one handler blob.