Add contacts (by id, ctr_…) to a list. Returns how many were newly added; contacts already on the list are ignored.
HTTP: POST /api/lists/{id}/contacts
| Field | Type | Required | Description |
|---|---|---|---|
contactIds |
array | ✓ |
add-list-contacts-response — see the add-list-contacts-response schema.
Object res = mk.addListContacts(Map.of("id", "lst_1", "contactIds", List.of("ctr_1", "ctr_2")));