Flexible API Versioning with Rails | Petr Hlavicka

API versioning is crucial for maintaining backward compatibility and allowing clients to update their integrations at their own pace. When we create an API, we establish (often) an unwritten contract with our clients: if they implement our API, it will function as expected, and they can rely on it without worrying about changes for a certain period, as outlined in our API Deprecation Strategy. When we introduce a change that breaks this contract (a breaking change), we need to release a new version of the API. This approach ensures that the old version remains operational for clients who have not yet upgraded.