Google is preparing to transition developers from using Google Identity Services (GIS) to the Federated Credential Management (FedCM) API in April. This move is part of Chrome’s efforts to phase out third-party cookies and provide a cookie-free alternative for user authentication. The FedCM API functions by leveraging a user agent as an intermediary between the website that needs to be signed into and the website that holds the user’s information for sign-in.
Developers will be automatically migrated to FedCM, and for most developers, this will happen seamlessly in the background without affecting user flows. However, websites with custom integrations might require minor adjustments to ensure a smooth transition.
To ensure a successful migration, it is recommended that developers experiment with FedCM and review the migration guide provided by Google. By embracing the Federated Credential Management API, developers can guarantee a reliable and secure sign-in process for their users, even without cookies. Stay tuned for more updates on this migration process.

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Google is transitioning developers from using Google Identity Services to the Federated Credential Management API, providing a cookie-free alternative for user authentication. Developers should experiment with FedCM and review the migration guide for a successful migration.

Google's Migration to Federated Credential Management API for Cookie-Free User Authentication