## The fixed charge object

### Example

```json
{
  "lago_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
  "lago_add_on_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
  "invoice_display_name": "Setup fee",
  "add_on_code": "setup_fee",
  "created_at": "2023-06-27T19:43:42Z",
  "code": "setup_fee",
  "charge_model": "standard",
  "pay_in_advance": false,
  "prorated": false,
  "properties": {
    "amount": "30",
    "graduated_ranges": [
      {
        "from_value": 0,
        "to_value": 10,
        "flat_amount": "10",
        "per_unit_amount": "0.5"
      }
    ],
    "volume_ranges": [
      {
        "from_value": 0,
        "to_value": 10,
        "flat_amount": "10",
        "per_unit_amount": "0.5"
      }
    ]
  },
  "units": 1,
  "lago_parent_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
  "taxes": [
    {
      "lago_id": "1a901a90-1a90-1a90-1a90-1a901a901a90",
      "name": "TVA",
      "code": "french_standard_vat",
      "rate": 20,
      "applied_to_organization": true,
      "created_at": "2023-07-06T14:35:58Z",
      "description": "French standard VAT"
    }
  ]
}
```

### Field Descriptions

- **lago_id**: Unique identifier of the fixed charge, created by Lago.

Example:  `"1a901a90-1a90-1a90-1a90-1a901a901a90"`

- **lago_add_on_id**: Unique identifier of the add-on associated with this fixed charge.

Example:  `"1a901a90-1a90-1a90-1a90-1a901a901a90"`

- **invoice_display_name**: Specifies the name that will be displayed on an invoice. Default is the charge name if not specified.

Example:  `"Setup fee"`

- **add_on_code**: Unique code used to identify the add-on.

Example:  `"setup_fee"`

- **created_at**: The date and time when the fixed charge was created in UTC format.

Example:  `"2023-06-27T19:43:42Z"`

- **code**: Unique code for the fixed charge.

Example:  `"setup_fee"`

- **charge_model**: The charge model for the fixed charge. Models available are `standard`, `graduated`, and `volume`.

Example:  `"standard"`

- **pay_in_advance**: Determines the billing timing for this fixed charge. `true` for immediate invoicing, `false` for invoicing at the end of the period.

Example:  `false`

- **prorated**: Specifies if a fixed charge is prorated based on the remaining days in the billing period.

Example:  `false`

- **properties**: List of all thresholds utilized for calculating the fixed charge.

- **units**: The number of units for the fixed charge.

Example:  `1`

- **lago_parent_id**: Unique identifier of the parent fixed charge (for plan versions).

Example:  `"1a901a90-1a90-1a90-1a90-1a901a901a90"`

- **taxes**: List of taxes applied to the fixed charge.