Bhavishya !
The admission fees of MBBS will be taken at the time of Admission after the Round 1 of Counselling.
The fees generally includes the amount to be paid for 1st Semester or 1st Year, depending upon the Health University of the State. It also includes the additional admission charges which is one-time.
The fees would be taken in cash itself.
There's no mode of online payment of the fees at least during the admission.
Subsequent fees can be paid online depending upon the College.

Hope this helps.

Good Luck !