PHP: session expiring automatically on some servers
<p>I have a website built using PHP. My website consists of some Education Material/Documents which users can get only when they pay for it through clickbank. On the backend, their payment status will change from "Unpaid" to "paid".</p>

<p>But when I test it by paying on clickbank website and redirecting back to my website, the session is automatically expiring. It is working fine on my system but not on client's system.</p>

<p>Please tell me what kind of issue is this? I will explain more if there is any further query.</p>
