public function actionIndex()
{
    echo "<pre>"; // for dumping temporary
    $messages = CustomerMessage::find()->where('state = :st', ['st' => 4])->all();
    $url = "https://ws.seur.com/webseur/services/WSConsultaExpediciones?wsdl";

    $client = new \SoapClient($url);

    $params = (object) [
        'in0' => 'S',
        'in1' => '', //tracking number dynamically changing in loop
        'in4' => '3126',
        'in11' => '0',
//            'in12' => 'wsecomm0270',
//            'in13' => 'ws0270ecomm',
        'in12' => 'WSkarpeDealC',
        'in13' => 'WSkarpeDealC',
        'in14' => 'N'
    ];

    foreach($messages as $message) {
        $trNr = $message->tracking_number;
        if($trNr != "" || $trNr != null) {
            $params->in1 = $trNr;
            break; //taking only first available for test
        }
    }

    $response = $client->consultaExpedicionesStr($params);
    var_dump($response);die;
}