| Name | Type | Description | Notes |
|---|---|---|---|
| duration | string | Defines the amount of time the voucher will be active in ISO 8601 format. For example, a voucher with a `duration` of `PT1H` will be valid for a duration of one hour. | [optional] |
| interval | string | Defines the intervening time between two time points in ISO 8601 format, expressed as a duration. For example, a voucher with an `interval` of `P2D` will be active every other day. | [optional] |