UpdateSMSCampaignRequest

{
    "name": "string",
    "message_body": "string",
    "template_id": "string",
    "template_params": {},
    "sender_id": "string",
    "contact_ids": [
        "string"
    ],
    "group_ids": [
        "string"
    ],
    "scheduled_at": "2019-08-24T14:15:22Z"
}