You’ve implemented logic that computes a dasher’s pay from order event logs (events include timestamps and state transitions). Design an HTTP API to expose this as a service. Cover: - Endpoints (e.g., compute pay for a dasher over a time window; submit events; query results) - Request/response schema (including datetime formats) - Idempotency strategy (to safely handle client retries) - Failure handling and retry semantics (client vs server retries, timeouts, backoff) - Validation and error codes - Observability (logging/metrics/tracing) Assume this API will be called by other internal services and must be robust to duplicate requests and partial failures.