# HelloSign::EventCallbackRequestEvent Basic information about the event that occurred. ## Properties | Name | Type | Description | Notes | | ---- | ---- | ----------- | ----- | | `event_time`*_required_ | ```String``` | Time the event was created (using Unix time). | | | `event_type`*_required_ | ```String``` | Type of callback event that was triggered. | | | `event_hash`*_required_ | ```String``` | Generated hash used to verify source of event data. | | | `event_metadata`*_required_ | [```EventCallbackRequestEventMetadata```](EventCallbackRequestEventMetadata.md) | | |