Series: The Journey from Legacy to Modern APIs - Part 2 When there is no direct replacement for an old API, the difficulty isn’t technical alone - it’s conceptual. The original system didn’t just provide functions. It provided meaning . A way of thinking about data, behaviour, and responsibility. The new API offers something different. Not better or worse - just different. Concepts have shifted. Responsibilities have moved. What was once implicit is now explicit. What was onc