Technical Review: SSO Single Sign-On Architecture across Subdomains

As we scale our companion products, we want a unified user profiles and membership checkout. Implementing a secure, lightweight single sign-on across wildcard subdomains was a major milestone.

Cross-Subdomain Cookies

By configuring cookie options in Supabase clients to bind to the root domain prefix .mvphubapp.com, we allow session cookies to be sent automatically to subdomains like albion.mvphubapp.com. This enables seamless premium access without prompting login redirects.