# GetCallsUsage200ResponseGroupsInner
## Properties
**key** | Option<**String**> | The group key: a `YYYY-MM-DD` UTC day, one of your numbers, or a channel. | [optional]
**calls** | Option<**i32**> | | [optional]
**answered** | Option<**i32**> | | [optional]
**minutes** | Option<**f64**> | | [optional]
**billable_usd** | Option<**f64**> | | [optional]
**meta_usd** | Option<**f64**> | | [optional]
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