Chapter 7 of the "How We Roll" series focuses on JWT Single Sign-On (SSO) and its integration with Backend as a Service (BaaS) providers like Firebase, Supabase, and Convex through Clerk. JWT, or JSON Web Token, acts as a cryptographically signed digital passport for users, allowing secure access to various web services by sharing a single logged-in state across multiple platforms. The chapter explains how Clerk facilitates authentication by generating custom JWTs that can be configured to meet the security requirements of different providers using templates on the Clerk Dashboard. These templates allow developers to define token lifetime, signing keys, issuer information, and custom claims, thus enabling seamless user authentication and authorization in applications that rely on BaaS. This setup allows developers to focus on building applications without handling complex backend configurations, as Clerk manages the authentication logic and integration with BaaS providers.