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# Method name: calculateAdditionalFees(options: Options, context: Context)

# Method package: wixEcom

# Method menu location: wixEcom --> EcomAdditionalFees --> calculateAdditionalFees

# Method Link: https://dev.wix.com/docs/velo/events-service-plugins/e-commerce/service-plugins/ecom-additional-fees/calculate-additional-fees.md

# Method Description:

Calculates additional fees to include in the cart and checkout pages.

The `calculateAdditionalFees` function calculates additional fees to appear in the cart and checkout pages of a store's site.
The function is automatically called by Wix when the cart totals are calculated, or when an action is performed in
the cart and/or checkout pages. For example, when an item is added to the cart, or when a shipping location is specified.

### Where to find `calculateAdditionalFees()`
When you [add the Additional Fees service plugin](https://dev.wix.com/docs/develop-websites/articles/code-tutorials/wix-e-commerce-stores/e-commerce-additional-fees-custom-extension.md#step-1-create-a-new-additional-fees-custom-extension), 
a folder is automatically added to your site. Use the `.js` file in the folder to write the code to calculate any additional fees to add to the cart or checkout.  

For more information on calculating your additional fees, see [Velo Tutorial: eCommerce Additional Fees Service Plugin](https://dev.wix.com/docs/develop-websites/articles/code-tutorials/wix-e-commerce-stores/e-commerce-additional-fees-custom-extension.md#my-extension-namejs).



# Method Code Examples:

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

## Calculate additional fees for an order

```javascript
import wixSiteBackend from 'wix-site-backend';

export const calculateAdditionalFees = async (options) => {
  let additionalFees = [];
  const feePrice = calculateWrappingFee(options.lineItems);
  const currency = await wixSiteBackend.generalInfo.getPaymentCurrency();

  if (feePrice) {
    additionalFees.push({
      code: 'fragile-packaging',
      name: 'Fragile Packaging',
      price: String(feePrice),
      taxDetails: {
        taxable: true
      }
    });
  }

  return {
    currency,
    additionalFees
  };
};

// Check if an item is fragile.
function isFragile(item) {
  const productName = item.productName.toLowerCase();
  return productName.includes('glass') || productName.includes('ceramic');
}

// Charge per fragile item.
// Give away free packaging when ordering at least 5 items.
function calculateWrappingFee(lineItems) {
  const minItemsForFreeWrapping = 5;
  let numFragileItems = 0;
  lineItems.forEach((item) => {
    if (isFragile(item)){
      numFragileItems += item.quantity;
    }
  });
  const shouldChargeFee = numFragileItems < minItemsForFreeWrapping;
  const price = shouldChargeFee ? numFragileItems : 0;
  return price;
}

```

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