Webhook

B 站确认关键支付状态后，通过服务器到服务器通知把最终状态同步给 A 站。

当前事件

{
  "id": "evt_20260820_...",
  "type": "payment.paid",
  "created_at": "2026-08-20T00:30:00+08:00",
  "data": {
    "payment_order_no": "PAY...",
    "merchant_order_no": "ORDER...",
    "amount": 289900,
    "currency": "CNY",
    "status": "PAID",
    "provider": "wechat",
    "provider_transaction_id": "...",
    "paid_at": "2026-08-20T00:29:58+08:00"
  }
}

A 站成功验签并处理后，应返回任意 2xx HTTP 状态。非 2xx、超时或网络失败都会进入重试队列。