SendSMSRequest

{
    "recipient_phone": "+2207654321",
    "message_body": "string",
    "sender_id": "string",
    "template_id": "string",
    "template_params": {
        "property1": "string",
        "property2": "string"
    },
    "scheduled_at": "2019-08-24T14:15:22Z",
    "contact_id": "string",
    "is_draft": false
}