If you've spent more than a few hours testing APIs, you know the drill: copy the token from the previous response, paste it into the Authorization header of the next request, remember to re-sign the HMAC payload before sending, then manually check the response body for the field you actually care about. It's tedious. It breaks your flow. And it's completely automatable. APIKumo has a pre/post processor pipeline baked directly into every request — no plugins, no scripts stored somewhere off to the side, no separate test runner. Here's how it works and why it matters. What are pre/post processors? Every request in APIKumo can have two processor layers: Pre-processors run before the request is sent — they can modify headers, compute signatures, inject dynamic values, or run custom JavaScript. Post-processors run after the response arrives — they can extract values, assert on status codes or body fields, log output, or pass data forward to the next request.…