v1.SendSMSAPIParams

{
    "contact_id": "string",
    "is_draft": true,
    "message_body": "string",
    "recipient_phone": "string",
    "scheduled_at": "string",
    "sender_id": "string",
    "template_id": "string",
    "template_params": {
        "property1": "string",
        "property2": "string"
    }
}