Couchbase Mobile version 1.3 introduces support for OpenID Connect (OIDC), enhancing authentication capabilities by allowing applications to authenticate users through trusted external sources. This feature simplifies the integration of authentication while eliminating the need for developers to manage the infrastructure themselves. In a typical use case, an application using Couchbase Lite as a local data store can replicate data to a backend server via a Sync Gateway, with OIDC facilitating user authentication through an OpenID Provider (OP). The OpenID Connect protocol, based on OAuth 2.0, employs REST/JSON message flows to streamline integration, offering three flows with the Authorization Code Flow being highlighted for its refresh capabilities to reduce frequent logins. The implementation involves creating an authenticator linked to replication objects, with the authentication process managed through callbacks and web views, although the use of system browsers is recommended for enhanced security. The configuration of Sync Gateway for OIDC, including setting up providers like GoogleAuthFlow, is essential for effective implementation in applications.