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12-payment — 支付、订单与票务业务逻辑 ​

信号Technique
通用订单/金额/状态机payment-logic.md
参数篡改、类型混淆、零元购payment-bypass.md
回调、异步、幂等与竞态payment-callback-async.md
余额/quota 共享行写入、Lost Update、乐观锁冲突payment-race-lost-update.md
订单邮件退信、游客查询与凭证 IDORpayment-email-bounce-idor.md
PHP 支付实现payment-php.md
订阅与续费payment-subscription.md
数字商品/IAPpayment-digital-goods.md

白盒参考源码固定在 ../../sources/,Technique 只保留可复用模型和验证步骤。

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