title: How do I retrieve a PDF of an invoice in QuickBooks API?
body: <p>Using IPP.NET SDK v2.0.1, need to get a PDF version of an invoice as a file, just like it would have been e-mailed to a customer.</p>
  
  <p>I have the <code>Invoice</code> object retrieved from the service already.</p>
  
  <p>How can this be done?</p>