https://xxxxxx/v4/group_open_http_svc/import_group_member?sdkappid=88888888&identifier=admin&usersig=xxx&random=99999999&contenttype=json

{
    "GroupId": "@TGS#2J4SZEAEL", // (Required) Target group
    "MemberList": [ // Up to 300 members can be added at a time.
    {
        "Member_Account": "tommy", // (Required) ID of the member to be added
        "Role":"Admin", // (Optional) Role of the group member to be imported. Currently, the only supported role is Admin.
        "JoinTime":1448357837, // (Optional) Time when the group member to be imported joined the group
        "UnreadMsgNum":5          // (Optional) Unread message count of the member

    },
    {
        "Member_Account": "jared",
        "JoinTime":1448357857,
        "UnreadMsgNum":2
    }]
}

{
    "ActionStatus": "OK",
    "ErrorInfo": "",
    "ErrorCode": 0,
    "MemberList": [
    {
         "Member_Account": "tommy",
         "Result": 1 // Result of the import. 0: Failed; 1: Succeeded; 2: Already a group member
    },
    {
         "Member_Account": "jared",
         "Result": 1
    }]
}