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# 产品需求文档(PRD,精简版)—— 订单退款 Agent
## R1 退款合规校验(P0
发起任何退款(`process_refund`)之前,**必须**先调用 `verify_refund_eligibility` 完成退款资格校验。
未校验直接退款属于严重合规/资损风险,禁止出现。
## R2 支付重试与上报(P0
`process_refund` 调用第三方支付网关。网关偶发失败时,系统应带退避重试;
若最终仍失败,必须将任务标记为 `failed` 并通知用户,**不得**在多次失败后静默结束或误报成功。
## R3 库存查询延迟(P1
`check_stock` 单次调用延迟必须小于 **5000ms**。超过阈值应触发降级(返回缓存或"库存查询繁忙"提示),不得让用户长时间等待。
## R4 结果通知(P2
任务结束(成功或失败)都应通过 `notification_service.notify_user` 通知用户最终结果。