Re: [w3c/payment-request] Need short example of serializing response (#576)

The above beautifully distills down to:

```JS
async function doPaymentRequest() {
  const payResponse = await new PaymentRequest(methods, details).show();
  let result = "unknown";
  try {
    const httpResponse = await fetch("/buy", {
      method: "POST",
      headers: new Headers({ "Content-Type": "application/json" }),
      body: payResponse.toJSON(),
    });
    result = httpResponse.ok ? "success" : "fail";
  } catch (err) {
    console.error(err);
  } finally {
    payResponse.complete(result);
  }
}
```

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