# Migrate from V1

If you have already integrated with our legacy event-based shopping integration, this page will help you migrate to the latest APIs.

## Access Shopping API

Shopping APIs v2 is only available after Firework SDK is loaded. It's important to listen to `fw-ready` event, as well as checking whether the script is loaded already.

```javascript
<script async src="//asset.fwcdn3.com/js/fwn.js" type="text/javascript" ></script>
<script>
  if (window._fwn?.shopping) {
    // if window._fwn?.shopping is loaded before this script tag, use it directly
  } else {
    document.addEventListener('fw-ready', () => {
      // window._fwn.shopping is available within the callback
    })
  }
</script>
```

## Configure Cart

You no longer need to manually create the `_fwnStoreFront` object, which is now deprecated. To enable the cart sync feature, you must call `_fwn.shopping.configureCart` method.

```javascript
window._fwn.shopping.configureCart({
  url: 'https://firework.com/cart',
  currency: 'USD'
})
```

## Product Hydration

Use `_fwn.shopping.onProductsLoaded` to set up an async callback. Stop listening to `fw:shopping:hydrate-products` event. Check [Product Hydration](/firework-for-developers/web/integration-guide/shopping-integration-v2/product-hydration.md) page for more details.

## Cart Sync

To sync the website cart items with the player, use `_fwn.shopping.onCartDisplayed` to set up an async callback. Stop listening to `fw:shopping:hydrate-cart` event.

To sync the player cart updates with the website cart, use `_fwn.shopping.onCartUpdated` to set up an async callback. Stop listening to `fw:shopping:cart-updated` event.

Check [Cart Sync](/firework-for-developers/web/integration-guide/shopping-integration-v2/cart-sync.md) page for more details.

## Product Factory

`validateRequiredFields` is added to `productFactory` as a second param. It can be used to verify whether you miss any required fields while creating a new FW product. You can turn it on to double check your existing factory method.


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