| Name | Type | Description | Notes |
|---|---|---|---|
| since | \DateTime | [optional] | |
| until | \DateTime | [optional] | |
| group_by | string | [optional] | |
| totals | \Zernio\Model\GetSmsUsage200ResponseTotals | [optional] | |
| groups | \Zernio\Model\GetSmsUsage200ResponseGroupsInner[] | Present (possibly empty) when `groupBy` is set. | [optional] |