The Nightmare of the Breaking Change When building a B2B SaaS platform at Smart Tech Devs, your API is a binding contract with your clients. Imagine a scenario where a client has integrated your API into their internal ERP system. One day, you decide to restructure the user payload, changing first_name and last_name into a single full_name field. You deploy the update, and instantly, your client's ERP integration crashes. Their workflows halt, and you lose their trust. In enterprise software, you cannot force external clients (or even older versions of your own mobile app) to update their code the exact second you update your backend. You must support older data structures while continuing to innovate. The solution is API Versioning . Architecting URL-Based Versioning While there are several ways to version APIs (like using Accept headers), URL-based versioning (e.g., /api/v1/ and /api/v2/ ) is the most explicit, cache-friendly, and developer-friendly approach for B2B platforms.…