v2ListCertificatesResponse

{
    "next_page_token": "string",
    "total_size": 0,
    "responses": [
        {
            "certificate": {
                "id": "string",
                "type": "TYPE_UNSPECIFIED",
                "created_at": "2019-08-24T14:15:22Z"
            },
            "user": {
                "id": "string",
                "created_at": "2019-08-24T14:15:22Z"
            }
        }
    ]
}