curl "https://ssl.newsman.app/api/1.2/rest/your_user_id/your_api_key/newsletter.setSegments.json?newsletter_id=40001&segment_ids[0]=30011&segment_ids[1]=30012"

<?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";
$newsletter_id = "40001"; // The id of the newsletter for which we want to return the properties
 
//Array of segments (one int per array item)
$segment_ids = array(
 segment_ids[0] => "30011",
 segment_ids[1] => "30012"
);
 
try {
	$client = new Newsman_Client($newsman_user_id, $api_key);
	$ret = $client->newsletter->setSegments($newsletter_id, $segment_ids);
} 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"
newsletter_id = 40001
 
segment_ids = [30011, 30012]
 
client = newsman.Newsman(user_id, api_key)
client.newsletter.setSegments(newsletter_id,segment_ids)

RESTClient client = new RESTClient("your_user_id", "your_api_key");
 
int[] _segment_ids = new int[]  { 30011,30012 };    
var _segment_ids = new NameValueCollection();
 
var _params = new NameValueCollection();
    _params["newsletter_id"] = "40001";
    _params["segment_ids"] = _segment_ids;
 
var response = client.CallMethod("newsletter", "setSegments", _params);