docs: update readme

README.md

@@ -47,13 +47,10 @@ npm install @discue/paddle-integration-mongodb
 For the webhooks integration to work and to be able to correlate incoming hooks with the correct subscription, a placeholder needs to be created **before the checkout** and - afterward - a specific value must be passed to the [Checkout API](https://developer.paddle.com/guides/ZG9jOjI1MzU0MDQz-pass-parameters-to-the-checkout) via the `passthrough` parameter. This value will be returned by the `addSubscriptionPlaceholder` method.
 
 ```js
-'use strict'
+import { SubscriptionHooks, subscriptionStorage } from '@discue/paddle-integration-mongodb'
 
-const readApiClient = require('./lib/your-application/read-api-client')
-const paddleIntegration = require('@discue/paddle-integration-mongodb')
-
-const storage = paddleIntegration.subscriptionStorage({ url: 'mongodb://localhost:27017' })
-const subscriptions = new paddleIntegration.SubscriptionHooks({ storage })
+const storage = subscriptionStorage({ url: 'mongodb://localhost:27017' })
+const subscriptions = new SubscriptionHooks({ storage })
 
 module.exports = async (req, res, next) => {
     // requires application to read api_client information