> ## Documentation Index
> Fetch the complete documentation index at: https://lago-ftr-wallet-improvements.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create add-ons

> Add-ons are a useful feature that allows you to add a fixed charge that is not recurring to one-off invoices.  This can be used to apply one-time fees such as a setup fee, one-time payment, or customer success fee.

<Tabs>
  <Tab title="Dashboard">
    To create an add-on through the user interface, follow these steps:

    1. Access the **"Add-ons"** section via the side menu;
    2. Click **"Add an add-on"**;
    3. Choose a name, a code, and a description (optional) for your add-on;
    4. Define its default value and currency (these values can be overwritten when creating the invoice); and
    5. Click **"Add add-on"** to confirm.
  </Tab>

  <Tab title="API">
    ```bash Create an add-on for "Setup Fees"
    LAGO_URL="https://api.getlago.com"
    API_KEY="__YOUR_API_KEY__"

    curl --location --request POST "$LAGO_URL/api/v1/add_ons" \
      --header "Authorization: Bearer $API_KEY" \
      --header 'Content-Type: application/json' \
      --data-raw '{
        "add_on": {
          "name": "Setup Fee",
          "code": "setup",
          "amount_cents": 50000,
          "amount_currency": "USD",
          "description": "Charge a setup fee for new customers."
        }
      }'
    ```
  </Tab>
</Tabs>

In the add-ons section, you can edit or delete add-ons by clicking the ellipsis icon.
Editing allows you to modify the name, code, description, and settings of the add-on, while deleting removes the add-on
from the list (this action cannot be undone). Please note that you cannot edit or delete an add-on that has already been applied
to a customer.

To assign an add-on to a customer, you need to create a one-off invoice.
Simply select the add-on(s) you wish to apply from the add-ons section while creating the invoice, and the fixed charge
will be added to the total amount due.