Design an Idempotent Payment Processing Platform
Company: Salesforce
Role: Member of Technical Staff
Category: System Design
Difficulty: medium
Interview Round: Onsite
Overview: Design a payment platform that prevents duplicate charges and handles ambiguous provider timeouts explicitly. The solution covers durable idempotency keys, conditional state transitions, bounded retries, reconciliation, webhook races, exact money, audit history, backpressure, and guarded operator repair.
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