title: Notify URL of PayPal
body: <p>PayPal successfully returns me the return URL that I specify while creating &quot;buy now&quot; button. But now I am confused. <strong>How do I retrieve details about the transaction that took place on PayPal?</strong> I also want to set some database values on the return URL. But I am afraid if my user navigates to that URL without paying, he will become a premium member nonetheless. How do I avoid this?</p>