Just learned that this is not my problem. I have got feedback
"But before that let me inform you that right now the PayTabs integration is not working from their end. We are on an active conversation with the PayTabs team about the 'Integration not working' issue.
Untill the issue is not resolved from their end, we cannot provide you the resolution."
Until it is fixed - PayTabs should be removed from the web site -
@neeraga - this is misleading the customers!