> Portal Navigation:
> 
> - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version.
> - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages).
> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
> - Top-level index of all portals: https://dev.wix.com/docs/llms.txt
> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

# Method name: updateCurrentCart(options: UpdateCurrentCartOptions)

# Method package: wixEcomBackend

# Method menu location: wixEcomBackend --> currentCart --> updateCurrentCart

# Method Link: https://dev.wix.com/docs/velo/apis/wix-ecom-backend/current-cart/update-current-cart.md

# Method Description:

Updates the current site visitor's cart.

>**Notes:**
>+ When adding catalog line items, the `lineItems.catalogReference.appId` and `lineItems.catalogReference.catalogItemId` fields are required.
>+ This method requires [visitor or member authentication](https://dev.wix.com/docs/rest/articles/getting-started/access-types-and-permissions.md).
>+ After a cart is updated, call [Refresh Cart](https://dev.wix.com/docs/velo/apis/wix-ecom-frontend/refresh-cart.md) to update the cart's UI elements and trigger the Cart Updated event.



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## Update the current site visitor's cart 

```javascript
/*****************************************
 * Backend code - my-backend-file.web.js *
 *****************************************/

import { Permissions, webMethod } from 'wix-web-module';
import { currentCart } from 'wix-ecom-backend';

export const myUpdateCurrentCartFunction = webMethod(Permissions.Anyone, async (options) => {
  try {
    const updatedCurrentCart = await currentCart.updateCurrentCart(options);
    console.log('Success! Updated current cart:', updatedCurrentCart);
    return updatedCurrentCart;
  } catch (error) {
    console.error(error);
    // Handle the error
  }
});

/*************
 * Page code *
 *************/

import wixEcomFrontend from 'wix-ecom-frontend';
import { myUpdateCurrentCartFunction } from 'backend/my-backend-file.web';

// Coupon code to apply to the current cart
const updateOptions = {
  "couponCode": "SUMMERSALE10"
}

const updatedCurrentCart = await myUpdateCurrentCartFunction(updateOptions);

// Refresh the cart after adding item.
await wixEcomFrontend.refreshCart();

// Navigate to the cart page.
await wixEcomFrontend.navigateToCartPage();

/* Updated cart:
 *
 * {
 *   "_id": "ba47a627-7bb8-4918-89b2-6a72af464765",
 *   "appliedDiscounts": [
 *    {
 *      "coupon": {
 *        "_id": "fbb94b06-7447-4161-9c48-59bfcdc39e77",
 *        "code": "SUMMERSALE10"
 *      }
 *    }
 *  ],
 *   "lineItems": [
 *     {
 *       "_id": "00000000-0000-0000-0000-000000000001",
 *       "quantity": 1,
 *       "catalogReference": {
 *         "catalogItemId": "c8539b66-7a44-fe18-affc-afec4be8562a",
 *         "appId": "215238eb-22a5-4c36-9e7b-e7c08025e04e"
 *       },
 *       "productName": {
 *         "original": "Shirt",
 *         "translated": "Shirt"
 *       },
 *       "url": "https://example.wixsite.com",
 *       "price": {
 *         "amount": "10",
 *         "convertedAmount": "10",
 *         "formattedAmount": "€10.00",
 *         "formattedConvertedAmount": "€10.00"
 *       },
 *       "fullPrice": {
 *         "amount": "10",
 *         "convertedAmount": "10",
 *         "formattedAmount": "€10.00",
 *         "formattedConvertedAmount": "€10.00"
 *       },
 *       "priceBeforeDiscounts": {
 *         "amount": "10",
 *         "convertedAmount": "10",
 *         "formattedAmount": "€10.00",
 *         "formattedConvertedAmount": "€10.00"
 *       },
 *       "descriptionLines": [],
 *       "image": "wix:image://v1/3c76e2_c5331f937348492a97df87b0a3b34ea4~mv2.jpg#originWidth=1000&originHeight=1000",
 *       "availability": {
 *         "status": "AVAILABLE"
 *       },
 *       "physicalProperties": {
 *         "sku": "364115376135191",
 *         "shippable": true
 *       },
 *       "couponScopes": [
 *         {
 *           "namespace": "stores",
 *           "group": {
 *             "name": "collection",
 *             "entityId": "00000000-000000-000000-000000000001"
 *           }
 *         },
 *         {
 *           "namespace": "stores",
 *           "group": {
 *             "name": "product",
 *             "entityId": "c8539b66-7a44-fe18-affc-afec4be8562a"
 *           }
 *         }
 *       ],
 *       "itemType": {
 *         "preset": "PHYSICAL"
 *       },
 *       "paymentOption": "FULL_PAYMENT_ONLINE"
 *     }
 *   ],
 *   "buyerInfo": {
 *     "visitorId": "4c7ce95c-9fb3-417d-9f02-b41e82b841f7"
 *   },
 *   "currency": "EUR",
 *   "conversionCurrency": "EUR",
 *   "buyerLanguage": "en",
 *   "siteLanguage": "en",
 *   "taxIncludedInPrices": false,
 *   "weightUnit": "KG",
 *   "subtotal": {
 *     "amount": "10",
 *     "convertedAmount": "10",
 *     "formattedAmount": "€10.00",
 *     "formattedConvertedAmount": "€10.00"
 *   },
 *   "appliedDiscounts": [],
 *   "inSync": true,
 *   "_createdDate": "2022-05-15T11:31:30.484Z",
 *   "_updatedDate": "2022-06-16T09:20:23.388Z"
 * }
 *
 */
```

---