Federated Credential Management (FedCM) Migration for Google Identity Services- Google Developers Blog

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This post details the migration of Google Identity Services (GIS) to the Federated Credential Management (FedCM) API due to the phasing out of third-party cookies in Chrome. It explains that for most developers, this migration will be seamless via backwards-compatible updates to the GIS library, which will call FedCM APIs behind the scenes. However, some websites with custom integrations (e.g., embedded iframes, non-compliant Content Security Policies) may require minor code changes. The post provides a migration timeline and a checklist for developers to verify functionality and opt-in to FedCM testing, with an option to temporarily exempt traffic until February 2025.