MessageRelations.get

{
    "success": true,
    "data": {
        "is_delete_protected": false,
        "id": "01234567-abcd-dcba-ffff-000000000000",
        "is_deleted": false,
        "modified": "2019-01-01T00:00:00",
        "created": "2019-01-01T00:00:00",
        "account": "http://example.com",
        "contact": "http://example.com",
        "custom_entity": "http://example.com",
        "lead": "http://example.com",
        "oppty": "http://example.com",
        "email": "http://example.com",
        "memo": "http://example.com",
        "project": "http://example.com",
        "quote": "http://example.com",
        "account_id": "01234567-abcd-dcba-ffff-000000000000",
        "contact_id": "01234567-abcd-dcba-ffff-000000000000",
        "custom_entity_id": "01234567-abcd-dcba-ffff-000000000000",
        "lead_oppty_id": "01234567-abcd-dcba-ffff-000000000000",
        "message_id": "01234567-abcd-dcba-ffff-000000000000",
        "project_id": "01234567-abcd-dcba-ffff-000000000000",
        "quote_id": "01234567-abcd-dcba-ffff-000000000000",
        "revision": 1
    }
}