Hello, I need help with postback pixel in some traffic sources for example AdXpansion. I setting postback url in ExoClick with help of template in Voluum. But I can't understand how to do this for AdXpansion. They have postback pixel: <img src="http://ct.adxpansion.com/conversions.php?id=XXXXX" width='1' height='1'/> Support from Voluum said. I need to place this pixel in "Thank You" page. So i need to put in CPA network? Also I see some people put this code in java script at landing page. But i don't know how it's work.