shopify-netlify-webhook.ts

import { Handler } from "@netlify/functions";
import crypto from "crypto";

// Signing key from https://{{your-account}}.myshopify.com/admin/settings/notifications
const { SHOPIFY_WEBHOOK_SECRET } = process.env;

const handler: Handler = async (event) => {
  const topic = event.headers["x-shopify-topic"];
  const shop = event.headers["x-shopify-shop-domain"];
  const hmac = event.headers["x-shopify-hmac-sha256"];

  if (!hmac || !shop || !topic) {
    return {
      statusCode: 400,
      body: JSON.stringify({ error: "Failed" }),
    };
  }

  const genHash = crypto
    .createHmac("sha256", SHOPIFY_WEBHOOK_SECRET)
    .update(event.body)
    .digest("base64");

  if (genHash !== hmac) {
    return {
      statusCode: 400,
      body: JSON.stringify({ error: "Failed" }),
    };
  }
  
  // Your code here  e.g. Add contact to mailchimp
  
  return {
    statusCode: 200,
    body: JSON.stringify({ message: "Hello World" })
  }
};

export { handler };