How to retrieve post vars sent by another page?
<p>I have a php page that opens and sends some variables to an external payment service (Sermepa). This page remains open while the payment process is active. When the payment process finishes it responds by sending a post request to a specified URL, without opening a browser window with the URL.</p>

<p>My question is: is it posible to catch the reponse post variables from this opened popup in the original window, to start another task as send stock or send invoice. Refreshing the original window is not possible, because I can not control the popup.</p>
