GET - https://subscribercrmapi-dev.galapagosconservation.org.uk/api/holdinggroupmember/contact/{contactId}

Lists all Holding Group Members for a contact.

[
{
"Id": 1,
"HoldingPersonalDetailsId": null,
"ContactId": 1234,
"GroupId": 1,
"DateFrom": "2025-06-23T00:00:00+00:00",
"DateTo": null,
"OfficeId": 2,
"StatusId": 3,
"Reason": "",
"ToRemove": false
},
{
"Id": 2,
"HoldingPersonalDetailsId": null,
"ContactId": 1234,
"GroupId": 1,
"DateFrom": "2025-08-23T00:00:00+00:00",
"DateTo": null,
"OfficeId": 2,
"StatusId": 3,
"Reason": "",
"ToRemove": false
}
]