Backend Challenges Teams Face When Processing Repeat Payments
freeCodeCamp.org2196 字 (约 9 分钟)
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Building reliable recurring payment systems requires solving scheduling and idempotency challenges; decoupling logic via event-driven architecture, persisting next billing dates, and using idempotency keys effectively prevents missed or duplicate charges.
入选理由：采用专用调度服务发布payment_due事件，将调度与扣款逻辑解耦以支持独立扩展和故障恢复。
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