## Update the selected shipping option

Use this method to update the selected shipping option. See [shippingOptions](/js/custom_checkout/session_object.md#custom_checkout_session_object-shippingOptions) for a list of the available shipping options.

This method returns a `Promise` that resolves with an object containing the following fields:
* `type`: one of either `"success"` or `"error"`
* `session`: only populated when `type` is `"success"`. Contains a [Session](/js/custom_checkout/session_object) instance representing the updated state.
* `error`: only populated when `type` is `"error"`. Contains an object with a string `message` field which can be displayed to your customer.

**Syntax:** `actions.updateShippingOption(...)`

- `shippingOption` (string)
  The [ID](/js/custom_checkout/session_object.md#custom_checkout_session_object-shippingOptions-id) of the shipping option to select.

### Update the selected shipping option

```jsx
actions.updateShippingOption('SHIPPING_OPTION_ID');
```