# Configure the widget `window.subblyConfig` takes a dozen keys. Five of them cover most first integrations: - `apiKey`: your Storefront API key. The only required key. - `languageCode`: a two-letter language. Without it, the widget takes the `lang` query parameter, then the `lang` attribute of ``, then the browser's language. - `settings`: the page hooks — which links the widget catches, which element opens it, which element shows the item count. See [Wire it into your page](/developer-resources/cart-widget/wire-it-into-your-page). - `init`: set it to `false` to boot the widget yourself. - `checkoutUrl`: a page on your site that owns the checkout. The widget sends the customer there and stands down on that path. ```html title="A typical config" ``` ## Boot the widget by hand With `init: false`, the loader sets no global. Call [`SubblyCart.initialize`](/reference/cart-widget/methods#initialize) yourself and keep the instance it returns: ```js title="Boot the widget by hand" window.subblyConfig = { init: false } window.addEventListener('subbly-cart-loaded', async () => { const cart = await window.SubblyCart.initialize({ apiKey: 'YOUR_STOREFRONT_API_KEY' }) cart.events.on(cart.events.type.CART_UPDATED, () => { console.log('cart changed') }) }) ``` Every key, with its type and default, is on [Configuration keys](/reference/cart-widget/settings#config). [`SubblyCart.initialize(config)`](/reference/cart-widget/methods#initialize) takes the same object, and you can change the URL keys later with [`configure`](/reference/cart-widget/methods#configure).