Hello Jiya,
No, you do not have to pay the fees again for mop up round, if you have already paid for it in your Counselling Round one. You just need to open the portal when the mop up round begins, because it is going to be conduct online and watch your seat if you get any.
Best of luck!
Thank you.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile