Reliable Feature Flag Middleware for Checkout Failures — Signal Before Noise

When a checkout page fires at 3 a.m., the useful question is not whether a flag exists. It is: which flag state did this request receive, and did that state change the failure path? For a B2B SaaS checkout, the least complicated useful design is middleware that fetches the flag value at request time, attaches the result to the request context, and lets the handler decide whether the feature is…