Modernizing authentication processes can be challenging due to the dependency on existing token formats, which are integral to applications for handling API access, sessions, and communication. Descope offers a solution with External Tokens, enabling organizations to adopt modern authentication features like passwordless options, MFA, and social login without altering backend token logic. External Tokens work through Connectors, which integrate seamlessly into existing systems by generating compatible tokens at the end of authentication flows, allowing frontends to update while backends remain unchanged. This method is particularly beneficial for applications where altering the token infrastructure is risky or costly, as it ensures compatibility and incremental upgrades without disrupting existing services. Connectors can be tailored for various platforms such as Firebase, Supabase, or custom systems, providing flexibility and control over token formats while leveraging Descope's advanced authentication capabilities.