Hey !

The registration dates for CSAB counselling , 2019 are july 25 to july 27. And same are the dates for payment of fee and choice filling. Once the candidate completes the registration , he/she has to pay the CSAB registration fee..Candidates who have successfully registered for CSAB 2019 special round counselling have to pay the participation fees. Payment of participation fee is to be done only through SBI MOPS payment gateway. Candidates who have registered earlier and paid registration fees for JoSAA 2019 have to pay the fee for CSAB special round fees again. Candidates who withdraw from counselling without accepting the seat will get complete refund of fees after deduction of Rs.1500. 

You can check the detailed fee structure by following the given link:

https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis

Hope it helps!