# Extensibility in WooCommerce Blocks <!-- omit in toc -->

## Table of Contents <!-- omit in toc -->

-   [Imports and dependency extration](#imports-and-dependency-extration)
-   [Hooks (actions and filters)](#hooks-actions-and-filters)
-   [REST API](#rest-api)
-   [Checkout Payment Methods](#checkout-payment-methods)
-   [Checkout Block](#checkout-block)

These documents are all dealing with extensibility in the various WooCommerce Blocks.

## Imports and dependency extration

The documentation in this section will use window globals in code examples, for example:

```js
const { registerCheckoutFilters } = window.wc.blocksCheckout;
```

However, if you're using `@woocommerce/dependency-extraction-webpack-plugin` for enhanced dependency management you can instead use ES module syntax:

```js
import { registerCheckoutFilters } from '@woocommerce/blocks-checkout';
```

See <https://www.npmjs.com/package/@woocommerce/dependency-extraction-webpack-plugin> for more information.

## Hooks (actions and filters)

| Document                      | Description                                             |
| ----------------------------- | ------------------------------------------------------- |
| [Actions](./hooks/actions.md) | Documentation covering action hooks on the server side. |
| [Filters](./hooks/filters.md) | Documentation covering filter hooks on the server side. |

## REST API

| Document                                                                                       | Description                                                         |
| ---------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| [Exposing your data in the Store API.](./rest-api/extend-rest-api-add-data.md)                 | Explains how you can add additional data to Store API endpoints.    |
| [Available endpoints to extend with ExtendSchema](./rest-api/available-endpoints-to-extend.md) | A list of all available endpoints to extend.                        |
| [Available Formatters](./rest-api/extend-rest-api-formatters.md)                               | Available `Formatters` to format data for use in the Store API.     |
| [Updating the cart with the Store API](./rest-api/extend-rest-api-update-cart.md)              | Update the server-side cart following an action from the front-end. |

## Checkout Payment Methods

| Document                                                                               | Description                                                                                                 |
| -------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------- |
| [Checkout Flow and Events](./checkout-payment-methods/checkout-flow-and-events.md)     | All about the checkout flow in the checkout block and the various emitted events that can be subscribed to. |
| [Payment Method Integration](./checkout-payment-methods/payment-method-integration.md) | Information about implementing payment methods.                                                             |
| [Filtering Payment Methods](./checkout-payment-methods/filtering-payment-methods.md)   | Information about filtering the payment methods available in the Checkout Block.                            |

## Checkout Block

In addition to the reference material below, [please see the `block-checkout` package documentation](../../../packages/checkout/README.md) which is used to extend checkout with Filters, Slot Fills, and Inner Blocks.

| Document                                                                                         | Description                                                                                                       |
| ------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------- |
| [How the Checkout Block processes an order](./checkout-block/how-checkout-processes-an-order.md) | The detailed inner workings of the Checkout Flow.                                                                 |
| [IntegrationInterface](./checkout-block/integration-interface.md)                                | The `IntegrationInterface` class and how to use it to register scripts, styles, and data with WooCommerce Blocks. |
| [Available Filters](./checkout-block/available-filters.md)                                       | All about the filters that you may use to change values of certain elements of WooCommerce Blocks.                |
| [Slots and Fills](./checkout-block/slot-fills.md)                                                | Explains Slot Fills and how to use them to render your own components in Cart and Checkout.                       |
| [Available Slot Fills](./checkout-block/available-slot-fills.md)                                 | Available Slots that you can use and their positions in Cart and Checkout.                                        |
| [DOM Events](./checkout-block/dom-events.md)                                                     | A list of DOM Events used by some blocks to communicate between them and with other parts of WooCommerce.         |
| [Filter Registry](../../../packages/checkout/filter-registry/README.md)                          | The filter registry allows callbacks to be registered to manipulate certain values.                               |

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