PHP sessions & cookies get lost when directing to a payment gateway?

I am working on a ecommerce site. sending value to payment gateway. While returning from payment gateway both session & cookies get lost. But if i click some other page session & cookie restored.

Help me sort out the issue.

session_start();  error_reporting(0);  $ch1=$_SESSION['login'];  $ch2= $_SESSION['loginname'];  if($ch1!=1)  {      header('location:login');  }  

https://stackoverflow.com/questions/67395048/php-sessions-cookies-get-lost-when-directing-to-a-payment-gateway May 05, 2021 at 12:05PM