KKH delivery and bills

Hi! Its my first time with KKH, was with SGH previously and it seems like their delivery bills and pmt are different. I know that for ward A and B1 we have to pay an upfront or deposit first. Can anyone explain to me how does KKH bills and pmt are made? Deposit will be made when we have decided on the rooms and beds? Or will it be made during the admissions of delivery (on the day of delivery/labour)? And the other pmts for any extra charges, can it be billed to home? And what are the extra charges for? From what i remembered when i was with sgh, everything were paid during the admission(labour) no need for any deposits. And bed were chosen on the day of delivery itself also. So everything was paid on the day itself. But then again, this was 5 yrs ago. Help me explain for KKH pls.