curl "https://ssl.newsman.app/api/1.2/rest/your_user_id/your_api_key/sms.scheduleCampaign.json?campaign_id=40001&schedule_time=2019-07-01%2010:12:15"

<?php
 
//client can de downloaded from https://github.com/Newsman/newsman-api-php
require_once("Newsman/Client.php");
 
// you can get your API KEY, your newsman_user_id and list_id from My account -> API
$newsman_user_id = "your-username";
$api_key = "your-api-key";
$campaign_id = "40001"; // The id of the newsletter for which we want to return the properties
$schedule_time = "2019-07-01 10:12:15"; //The schedule UNIVERSAL Time (UTC / GMT+0), format: YYYY-MM-DD HH:II:SS
 
try {
	$client = new Newsman_Client($newsman_user_id, $api_key);
	$ret = $client->sms->scheduleCampaign($campaign_id, $schedule_time);
} catch (Exception $e) {
	//do something with the error, eg: log $e->getMessage()
}
 
return $ret;
 
?>

import newsman
 
user_id = "your_user_id"
api_key = "your_api_key"
campaign_id = 40001
schedule_time = "2019-07-01 10:12:15"
 
client = newsman.Newsman(user_id, api_key)
client.sms.scheduleCampaign(campaign_id,schedule_time)

RESTClient client = new RESTClient("your_user_id", "your_api_key");
 
var _params = new NameValueCollection();
    _params["campaign_id"] = "40001";
    _params["schedule_time"] = "2019-07-01 10:12:15";
 
var response = client.CallMethod("sms", "scheduleCampaign", _params);