curl --request GET \
  --url https://api.streamkap.com/consumer-groups/{group_id} \
  --header 'Authorization: Bearer <token>'

{
  "group_id": "<string>",
  "state": "<string>",
  "is_simple_consumer_group": true,
  "total_members": 123,
  "total_topics": 123,
  "page": 123,
  "page_size": 123,
  "partition_assignor": "<string>",
  "members": [
    {
      "member_id": "<string>",
      "client_id": "<string>",
      "host": "<string>"
    }
  ],
  "topics": [
    {
      "topic": "<string>",
      "partition": 123,
      "member_id": "<string>",
      "current_offset": 123,
      "log_end_offset": 123,
      "lag": 123
    }
  ],
  "total_lag": 0,
  "coordinator": "<string>"
}