| Name | Type | Description | Notes |
|---|---|---|---|
| userId | String | Member user ID. | [optional] |
| role | Integer | Member role. `1` regular member, `2` admin, `3` owner. | [optional] |
| nickname | String | Member nickname in the group. | [optional] |
| extra | String | Additional member profile information. | [optional] |
| joinedAt | Long | Timestamp when the member joined the group. | [optional] |