> ## 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.

# The add-on object

> This object represents an add-on, a one-time fee that can be applied on one-off invoices.

<RequestExample>
  ```json The add-on object
  {
    "add_on": {
      "lago_id": "b7ab2926-1de8-4428-9bcd-779314ac129b",
      "name": "Setup Fee",
      "code": "setup_fee",
      "amount_cents": 50000,
      "amount_currency": "USD",
      "description": "Implementation fee for new customers.",
      "created_at": "2022-04-29T08:59:51Z"
      "taxes": [
        {
          "lago_id": "31eedf19-b176-4666-a920-3c08d1204838",
          "name": "french_vat",
          "code": "french_vat",
          "rate": 20.0,
          "description": "",
          "applied_to_organization": false,
          "add_ons_count": 1,
          "customers_count": 0,
          "plans_count": 0,
          "charges_count": 0,
          "created_at": "2022-04-29T08:59:51Z"
        }
      ]
    }
  }
  ```
</RequestExample>

## Attributes

<ResponseField name="add-on" type="object">
  <Expandable title="object" defaultOpen="true">
    <ResponseField name="lago_id" type="string" required>
      Unique identifier of the add-on, created by Lago.
    </ResponseField>

    <ResponseField name="name" type="string" required>
      The name of the add-on.
    </ResponseField>

    <ResponseField name="code" type="string" required>
      Unique code used to identify the add-on.
    </ResponseField>

    <ResponseField name="amount_cents" type="integer" required>
      The cost of the add-on in cents, excluding any applicable taxes, that is billed to a customer. By creating a one-off invoice, you will be able to override this value.
    </ResponseField>

    <ResponseField name="amount_currency" type="string" required>
      The currency of the add-on.
    </ResponseField>

    <ResponseField name="description" type="string">
      The description of the add-on.
    </ResponseField>

    <ResponseField name="created_at" type="string" required>
      The date and time when the add-on was created. It is expressed in UTC format according to the ISO 8601 datetime standard. This field provides the timestamp for the exact moment when the add-on was initially created.
    </ResponseField>

    <ResponseField name="tax_codes" type="string[]">
      List of unique code used to identify the taxes.
    </ResponseField>
  </Expandable>
</ResponseField>