How will I troubleshoot this problem e.g. on domain https://www.demo.qualityunit.com/pax4/
1. I will check if script clickjs.php generates valid javascript file by entering url to my browser: https://www.demo.qualityunit.com/pax4/scripts/clickjs.php
2. If this is working, I will check, if I have correct click integration code inserted from merchant panel.
Integration code you can copy and paste again from Tools -> Integration -> Clicks menu
e.g. in my case is correct code:
<script id="pap_x2s6df8d" src="https://www.demo.qualityunit.com/pax4/scripts/clickjs.php" type="text/javascript"> </script> <script type="text/javascript"> <!-- papTrack(); //--> </script>