curl --request GET \
  --url https://api.example.com/api/storefront/cart/{cart_id} \
  --header 'X-Site-ID: <x-site-id>'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "items": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "variant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "product_name": "<string>",
      "variant_name": "<string>",
      "sku": "<string>",
      "image_url": "<string>",
      "price": "<string>",
      "quantity": 123,
      "total": "<string>"
    }
  ],
  "subtotal": "<string>",
  "items_count": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}