| Name | Type | Description | Notes |
|---|---|---|---|
| type | string | [optional] | |
| amount | double | The <code>details[].perUnitAmount</code> multiplied by the <code>quantity</code> of the line item. | [optional] |
| per_unit_amount | double | The fee amount per unit. | [optional] |
| id | string | The Fee's unique identifier. | [optional] |