index.ts

// Follow this setup guide to integrate the Deno language server with your editor:
// https://deno.land/manual/getting_started/setup_your_environment
// This enables autocomplete, go to definition, etc.

import { serve } from "std/server";

// Import via bare specifier thanks to the import_map.json file.
import Stripe from "stripe";

const stripe = new Stripe(Deno.env.get("STRIPE_API_KEY") as string, {
  // This is needed to use the Fetch API rather than relying on the Node http
  // package.
  apiVersion: "2022-11-15",
  httpClient: Stripe.createFetchHttpClient(),
});
// This is needed in order to use the Web Crypto API in Deno.
const cryptoProvider = Stripe.createSubtleCryptoProvider();

console.log("Hello from Stripe Webhook!");

serve(async (request) => {
  const signature = request.headers.get("Stripe-Signature");

  // First step is to verify the event. The .text() method must be used as the
  // verification relies on the raw request body rather than the parsed JSON.
  const body = await request.text();
  let receivedEvent;
  try {
    receivedEvent = await stripe.webhooks.constructEventAsync(
      body,
      signature!,
      Deno.env.get("STRIPE_WEBHOOK_SIGNING_SECRET")!,
      undefined,
      cryptoProvider
    );
  } catch (err) {
    return new Response(err.message, { status: 400 });
  }
  console.log(receivedEvent);
  return new Response(JSON.stringify({ ok: true }), { status: 200 });
});