title: Paypal PDT transaction ID expiration period
body: <p>I got error 4003 from paypal PDT when I was trying to retrieve payment information using the transaction ID. Although I there's a similar thread here : <a href="https://stackoverflow.com/questions/8521800/paypal-pdt-error-4003">Paypal PDT error 4003</a></p>
  
  <p>and I believe the answer is because of my transaction ID has expired. However, I couldn't find any info of how long will the transaction ID expired.</p>
  
  <p>p/s: My system is able to retrieve PDT info perfectly right after user return from paypal.</p>