OTRS. Update Tickets

i am having problem updating otrs tickets in custom portal. I am using PHP via Soap Api. Here is some thing i tried. I created a webservice . In OTRS as provider, Network Transport , i added namespace https://otrs.classic.com.np/otrs/GenericInterface/actions .<-----is this correct???????????? and my php code is as follows

$url      = "https://myurl.com/otrs/nph-genericinterface.pl";  // URL for OTRS server

            $namespace = "https://myurl.com/otrs/GenericInterface/actions";
            $username = "ctdeveloper";  // SOAP username set in sysconfig
            $password = "ctdeveloper";  // SOAP password set in sysconfig


            ### Form Fields

            $new_owner =$_POST['new_owner'];
            $subject =$_POST['subject'];
            $text = $_POST['text'];
            $note_type = $_POST['note_type'];

            #### Initialize new client session ####
            $client = new SoapClient(
                null,
                array(
                    'location'  => $url,
                    'uri'       => $namespace,
                    'trace'     => 1,
                    'login'     => $username,
                    'password'  => $password,
                    'style'     => SOAP_RPC,
                    'use'       => SOAP_ENCODED
                )
            );

            #### Create a new ticket shell. The function returns the Ticket ID ####
            $TicketUpdate = $client->__soapCall(
                "Dispatch", array($username, $password,"ctdeveloper",
                    "TicketObject", "TicketUpdate",
                    "TicketID", $ticket_id,
                    "OwnerID",      $new_owner,
                )
            );

Ok I found this answer. Hope it helps everyone. Firstly create a webservice in admin of OTRS

$URL = 'https://your-url.com/otrs/nph-genericinterface.pl/Webservice/WebserviceName'; //webserviceName is the name of webservice created from admin panel of otrs
$namespace = 'https://your-url.com/otrs/GenericInterface/actions'; //namespace of soap config

$username = "username"; //// SOAP username set in sysconfig
$password = "password"; //// SOAP password set in sysconfig

// initialize a SoapClient instance
$SOAPClientInstance = new \SoapClient(null, array(
'location'=> $URL,
'uri' => $namespace,
'trace' => 1,
'login' => $username,
'password'=> $password,
'style' => SOAP_RPC,
'use' => SOAP_ENCODED,

)
);


// set the request parameters as an array of SoapParam instances
$TicketRequestArray = array(

new \SoapParam('username', 'UserLogin'), //user username
new \SoapParam('password', "Password"),// user password
);

$TicketRequestArray[] = new \SoapParam('123', 'TicketID');// ID of ticket which is to be updated
$TicketRequestArray[] = new \SoapParam(array(
'State' => 'open',
'OwnerID' => $new_owner, // you can add which parameters to update
), 'Ticket');
$Action = 'TicketUpdate';

$Response = $SOAPClientInstance->__soapCall($Action,
$TicketRequestArray
);

print "<pre>\n";
print "Request :\n".htmlspecialchars($SOAPClientInstance->__getLastRequest()) ."\n";
print "Response:\n".htmlspecialchars($SOAPClientInstance->__getLastResponse())."\n";
print "</pre>";