Error cases

Some unique_key do not exist (207)

{
    "time": 307,
    "errors": 1,
    "status": null,
    "items": [
        {
            "contact_id": "976testpostman104@test.test3",
            "code": 400,
            "description": "Contact not found for id test1@test.test"
        },
        {
            "contact_id": "test@test.test1",
            "code": 204,
            "description": ""
        }
    ]
}

No unique_key exist at all (400)

{
    "time": 138,
    "errors": 2,
    "status": null,
    "items": [
        {
            "contact_id": "ee",
            "code": 400,
            "description": "Contact not found for id ee."
        },
        {
            "contact_id": "e",
            "code": 400,
            "description": "Contact not found for id e."
        }
    ]
}