Design an API for pay computation with retries

Q: Design an API for pay computation with retries

Assesses the candidate's ability to design robust HTTP APIs covering endpoint modeling, request/response schemas, datetime formats, idempotency strategies, retry semantics, validation/error codes, and observability for pay-computation services.

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Question

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.

Design an API for pay computation with retries

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