title: IPN with Express Checkout
body: <p>I'm overflowed a little bit reading Introducing IPN <a href="https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNIntro/" rel="nofollow">https://developer.paypal.com/webapps/developer/docs/classic/ipn/integration-guide/IPNIntro/</a>:</p>
  
  <p>at the begiining: "IPN is a message service that PayPal uses to notify you about events, such as: Instant payments, including Express Checkout, ..."</p>
  
  <p>at the end: "If you are using Express Checkout ... You should not use IPN for this purpose."</p>
  
  <p>Perhaps anybody knows correct option - to use or not to use IPN with Expres Checkout?</p>