幂等性

// 1. 生成不超过 32 字符的唯一幂等键
const paymentRequestId = generateUniqueRequestId();

// 2. Persist (before sending the request!)
await db.order.create({ paymentRequestId, status: 'PENDING' });

// 3. Send the request
try {
  const response = await waffo.order().create({ paymentRequestId, ... });
} catch (e) {
  if (e instanceof WaffoUnknownStatusException) {
    // 4. Unknown status: inquire, do not retry create
    const inquiry = await waffo.order().inquiry({ paymentRequestId });
  }
}