| Name | Type | Description | Notes |
|---|---|---|---|
| quantity | String | Number of units used. | [optional] |
| start_date | Date | The start date of a usage period as `yyyy-mm`. Zuora uses this field value to determine the usage date. | [optional] |
| unit_of_measure | String | Unit by which consumption is measured, as configured in the Billing Settings section of the web-based UI. | [optional] |