Set recurrent time periods when the promotion tier is valid. For example, valid for 1 hour every other day.start_date required when including the validity_timeframe.
| Name | Type | Description | Notes |
|---|---|---|---|
| interval | String | Defines the intervening time between two time points in ISO 8601 format, expressed as a duration. For example, a promotion tier with an `interval` of `P2D` will be active every other day. | [optional] |
| duration | String | Defines the amount of time the promotion tier will be active in ISO 8601 format. For example, a promotion tier with a `duration` of `P1D` will be valid for a duration of one day. | [optional] |