The ReqRun boundary
ReqRun does not receive, verify, sign, or route callbacks in v1. Use ReqRun from your webhook handler when the event triggers an OpenAI request that needs retries and status.
How ReqRun helps
Use the provider event id as the idempotency key. If the sender retries the webhook, ReqRun returns the same durable request instead of creating duplicate LLM work.