feat(example): create-checkout and webhook-server examples

Author: thedevyashsaini

examples/scrawn/create-checkout.ts

@@ -0,0 +1,9 @@
+import { biller } from "./biller.ts";
+
+const userId = "c0971bcb-b901-4c3e-a191-c9a97871c39f";
+
+const url = await biller.collectPayment(userId);
+
+console.log(`\nCheckout URL for ${userId}:`);
+console.log(url);
+console.log();

examples/scrawn/webhook-server.ts

@@ -0,0 +1,30 @@
+import express from "express";
+import { scrawn, toWebRequest } from "@scrawn/core";
+import { biller } from "./biller.ts";
+
+const app = express();
+
+app.post(
+  "/webhooks/scrawn",
+  express.raw({ type: "application/json" }),
+  async (req, res) => {
+    try {
+      const event = await biller.webhook(toWebRequest(req, req.body));
+
+      console.log(`\n=== ${event.resource}.${event.action} ===`);
+      console.log("ID:", event.id);
+      console.log("Data:", JSON.stringify(event.data, null, 2));
+      console.log("========================\n");
+
+      res.status(200).json({ received: true });
+    } catch (error) {
+      const message = error instanceof Error ? error.message : "Unknown error";
+      console.error("Webhook verification failed:", message);
+      res.status(401).json({ error: message });
+    }
+  }
+);
+
+app.listen(3000, () => {
+  console.log("Webhook receiver listening on http://localhost:3000");
+});