usually RM0.00

if you have some Fees charged to the card, this line will show the GST 6% separately.

different bank show this differently. Maybank has a full-page table for this.

yep, all these services are GST taxable.

in the transaction, there would be 2 lines: Bank Transfer Fee & GST on Bank Transfer Fee.
that one line below GST PAYABLE @ 6% is just the summary of up all the GST fees being charged to the current statement.
it's just like any other receipts, you would see the total GST amount charged to the particular bill.