title: Pushwoosh notification without sound
body: <p>How can we send pushnotification without sound using pushwoosh php API</p>
  
  <p>below is my code</p>
  
  <pre><code>pwCall('createMessage', array(
      'application' =&gt; PW_APPLICATION,
      'auth' =&gt; PW_AUTH,
      'notifications' =&gt; array(
              array(
                  'send_date' =&gt; 'now',
                  'content' =&gt; $podcast_title,
                  'data' =&gt; array('custom' =&gt; json_encode($cus_data)),
                  'link' =&gt; 'https://bnc.lt/castbox',
                  'ios_sound' =&gt;'',
                  'android_sound' =&gt;'silent.wav',
                  'platforms'=&gt;array(3),
                  //'devices'=&gt;array('f82759fc4ca672e27bae0a509710167f52e24577db6d4b5da87e51f8b9ab3b47'),             
                  //'conditions'=&gt;array(array($tag,"EQ",$filter_name)),
              )
          )
      )
  );
  </code></pre>
  
  <p>Thanks</p>
  
  <p>Thanigaivelan</p>