title: How to get the valid shipping service of ebay trading api using ebatNs?
body: <p>I am getting an error like this:</p>
  
  <pre><code>#21915469 : At least one valid shipping service must be specified.
  </code></pre>
  
  <p><strong>The code that I'm using:</strong></p>
  
  <pre><code>$ShippingServiceOptions = new ShippingServiceOptionsType(); 
  $ShippingServiceOptions-&gt; setShippingService('DE_InsuredDispatch');  
  $ShippingServiceOptions-&gt; setShippingServiceCost('3.33'); 
  $ShippingServiceOptions-&gt; setShippingServiceAdditionalCost('2.5');
  $ShippingServiceOptions-&gt; setShippingServicePriority('1');
  
  $shipping[]=$ShippingServiceOptions;
  </code></pre>