| Name | Type | Description | Notes |
|---|---|---|---|
| unit | String | The unit of time. | |
| length | Integer | The length of time. | |
| limit | Integer | The number of invoices this subscription order will generate (if 1, it will not generate any beyond the initial order creation). For example, set this property to `12`, when the `periodUnit` is month and the `periodDuration` is 1, for a 1 year contract billed monthly. | [optional] |
| billing_timing | PlanBillingTiming | [optional] |