Re: [w3c/payment-request] editorial: add example of .toJSON()+fetch POST (#583)

domenic commented on this pull request.



> +          "fetch">Fetch API</a>:
+        </p>
+        <pre class="example">
+          async function doPaymentRequest() {
+            const payRequest = new PaymentRequest(methodData, details, options);
+            const payResponse = await payRequest.show();
+            let result = "unknown";
+            try {
+              const httpResponse = await fetch("/process-payment", {
+                method: "POST",
+                headers: new Headers({ "Content-Type": "application/json" }),
+                body: payResponse.toJSON(),
+              });
+              result = httpResponse.ok ? "success" : "fail";
+            } catch (err) {
+              console.error(err);

Maybe do a quick parse of response.json() ? I dunno. I have a hard time understanding "unknown" in real-world systems...

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