POST - https://v2.api-community-tu.org/api/groupmember

Updates or Add an existing Group Member.

{
"Id": 1,
"GroupId": 1,
"ContactId": 1234,
"DateFrom": "2026-06-06T00:00:00+01:00",
"DateTo": null,
"OfficeId": 2,
"StatusId": 3,
"Reason": ""
}