I would like to know is there any way to fetch and update a checkout using Shopify Storefront GraphQL?

Note that: the checkout is created by the user using normal web flow on the storefront. It means the checkout is not created by GraphQL.

Let's consider this scenario:

• The user visits the website and makes a checkout
• The user abandoned the checkout.

From Shopify admin I can get the abandoned checkout URL: https: //mysite.com/1111111/checkouts/foo/recover?key=bar Based on this URL I make a GraphQL request by using Shopify js-buy-sdk:

const client = ShopifyBuy.buildClient({
     domain: 'mysite.myshopify.com',
     storefrontAccessToken: 'xxxxxx'
});

// I tried both base64 and raw string version
const checkoutId=`gid://shopify/Checkout/foo?key=bar`

client.checkout.fetch(checkoutId).then((checkout) => {
     console.log('checkout', checkout);
})

The server response null.

Any help would be greatly appreciated. Many thanks!