`typescript
import { AppServer, InMemoryShopRepository } from '@shopware-ag/app-server-sdk'
import { createNotificationResponse } from '@shopware-ag/app-server-sdk/helper/app-actions'

const app = new AppServer({
appName: 'MyApp',
appSecret: 'my-secret',
authorizeCallbackUrl: 'http://localhost:3000/authorize/callback',
}, new InMemoryShopRepository());

const server = Bun.serve({
port: 3000,
async fetch(request) {
const { pathname } = new URL(request.url);
if (pathname === '/authorize') {
return app.registration.authorize(request);
} else if (pathname === '/authorize/callback') {
return app.registration.authorizeCallback(request);
} else if (pathname === '/app/product') {
const context = await app.contextResolver.fromAPI(request);

// do something with payload, and http client

const notification = createNotificationResponse('success', 'Product created');

// sign the response, with the shop secret
await app.signer.signResponse(notification, context.shop.getShopSecret());

return resp;
}

return new Response('Not found', { status: 404 });
},
});

console.log(Listening on localhost:${server.port});
`