My AI Agent Charged a Customer Twice in 11 Seconds

说明与用途

Webhook 重复处理导致双重扣费。解决方案：通过跟踪支付提供商的事件 ID，先记录再执行操作，使处理器幂等，忽略已处理的事件。

问题

Duplicate payment charges were created because the webhook handler did not dedupe repeated events, leading to a customer being charged twice.

结果

Prevented double charges by making the webhook handler idempotent; added duplicate‑event tests and nightly reconciliation to catch similar issues early.

工作流

• Receive payment.succeeded webhook
• Extract event_id from payload
• Check if event_id already processed in durable store
• If processed, return success and skip
• If not, record event_id
• Charge customer
• Provision account
• Send receipt email
• Return success

证据

The provider had sent the payment.succeeded event three times.

来源

The fix is small enough to be almost insulting, which is the point.

来源