I will diagnose one failing payment webhook scenario and turn it into a deterministic, reproducible test.
This entry package is designed for a single endpoint and one event type. I will inspect sanitized code, payloads, headers, and logs to determine whether the failure comes from:
- raw-body or JSON parsing;- signature construction or comparison;- missing, renamed, or case-sensitive headers;- timestamp tolerance or clock drift;- incorrect success and error status codes;- provider retries, duplicate delivery, or missing idempotency;- unexpected event-status mapping.
You receive one automated reproduction test or minimal runnable reproduction, a concise root-cause report, a prioritized fix checklist, sanitized fixtures, and one revision for clarification or correction within the agreed scenario.
This package diagnoses the failure; it does not include the production code fix, deployment, database migration, multiple endpoints, or live-provider configuration. If you want the fix implemented after diagnosis, use my HMAC hardening or full webhook testing service.
I do not need production credentials, private keys, seed phrases, live funds, or customer data.