invite_multi

{
            "actionId": "1387016937022",
            "controlId": "1028871338513",
            "content": {
                "act": "invite_multi",
                "data": {
                    "to_uid": "4842706102851498993",
                    "from_uid": "353242569550882339",
                    "grid_error_map": {
                        "4903910132261211851": 0
                    }
                },
                "act_type": "group"
            }
        }