woocommerce/plugins/woocommerce-blocks/docs/extensibility/available-slot-fills.md

# Available Slots

This document presents the list of available Slots that you can use for adding your custom content (Fill):

- [ExperimentalOrderMeta](#experimentalordermeta)
- [ExperimentalOrderShippingPackages](#experimentalordershippingpackages)
- [ExperimentalDiscountsMeta](#experimentaldiscountsmeta)

***

If you want to add a new SlotFill component, check the [Checkout - Slot Fill document](../../packages/checkout/slot/README.md). To read more about Slot and Fill, check the [Slot and Fill document](./slot-fills.md).

**Note About Naming:** Slots that are prefixed with `Experimental` are experimental and subject to change or remove. Once they graduate from the experimental stage, the naming would change and the `Experimental` prefix would be dropped.
Check the [Feature Gating document](../blocks/feature-flags-and-experimental-interfaces.md) from more information.


## ExperimentalOrderMeta
This Slot renders below the Checkout summary section and above the "Proceed to Checkout" button in the Cart.

<img width="1135" alt="image" src="https://user-images.githubusercontent.com/6165348/118398683-a0202700-b651-11eb-8a4f-cd8b6ebff53f.png">

### Passed parameters

- `cart`: `wc/store/cart` data but in `camelCase` instead of `snake_case`. [Object breakdown.](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/c00da597efe4c16fcf5481c213d8052ec5df3766/assets/js/type-defs/cart.ts#L172-L188)
- `extensions`: external data registered by third-party developers using `ExtendRestAPI`. If you used `ExtendRestAPI` on `wc/store/cart` you would find your data under your namespace here.

## ExperimentalOrderShippingPackages
This slot renders inside the shipping step of Checkout and inside the shipping options in Cart.

Cart:

<img width="1151" alt="image" src="https://user-images.githubusercontent.com/6165348/118399054-2b4dec80-b653-11eb-94a0-989e2e6e362a.png">

Checkout:

<img width="1233" alt="image" src="https://user-images.githubusercontent.com/6165348/118399133-90094700-b653-11eb-8ff0-c917947c199f.png">

### Passed parameters

- `collapsible`: `Boolean` If a shipping package panel should be collapsible or not, this is false in Checkout and true in Cart.
- `collapse`: `Boolean` If a panel should be collapsed by default, this is true if there's more than 1 fill registered (Core Shipping options are registered as a fill and they're counted).
- `showItems`: `Boolean` If we should show the content of each package, this is true if there's more than 1 fill registered (Core Shipping options are registered as a fill and they're counted).
- `noResultsMessage`: A React element that you can render if there are no shipping options.
- `renderOption`: a render function that takes a rate object and returns a render option.
- `cart`: `wc/store/cart` data but in `camelCase` instead of `snake_case`. [Object breakdown.](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/c00da597efe4c16fcf5481c213d8052ec5df3766/assets/js/type-defs/cart.ts#L172-L188)
- `extensions`: external data registered by third-party developers using `ExtendRestAPI`, if you used `ExtendRestAPI` on `wc/store/cart` you would find your data under your namespace here.
- `components`: an object containing components you can use to render your own shipping rates, it contains `ShippingRatesControlPackage`.

## ExperimentalDiscountsMeta
This slot renders below the `CouponCode` input. 

Cart:
<img alt="Cart showing ExperimentalDiscountsMeta location" src="https://user-images.githubusercontent.com/5656702/122774218-ea27a880-d2a0-11eb-9450-11f119567f26.png" />

Checkout:
<img alt="Checkout showing ExperimentalDiscountsMeta location" src="https://user-images.githubusercontent.com/5656702/122779606-efd3bd00-d2a5-11eb-8c84-6525eca5d704.png" />

### Passed paramters
- `cart`: `wc/store/cart` data but in `camelCase` instead of `snake_case`. [Object breakdown.](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/c00da597efe4c16fcf5481c213d8052ec5df3766/assets/js/type-defs/cart.ts#L172-L188)
- `extensions`: external data registered by third-party developers using `ExtendRestAPI`, if you used `ExtendRestAPI` on `wc/store/cart` you would find your data under your namespace here.