Why we diagram webhooks before touching code

When two systems promise to stay in sync, the failure modes are almost never glamorous. They hide inside retries, partial payloads, and fields renamed by a well-meaning admin. That is why our briefings start with diagrams instead of credentials.

We sketch the happy path, then annotate three unhappy paths: delayed webhooks, duplicate keys, and schema drift. The goal is not pessimism—it is shared vocabulary. Once revenue and lifecycle leaders agree on what “healthy” looks like, engineers can instrument with confidence.

During the Seoul Stack Sync track we pressure-test assumptions with sample payloads drawn from your sandbox. If a step cannot be simulated safely, we mark it as a limitation instead of pretending the risk evaporates.

Finally, we leave an activity log outline so post-launch reviews stay grounded. The write-up is plain language on purpose: it has to survive handovers when teams rotate.