you can just try yourself lor.. .see what info it require .. .whether expiry mm/yy or cvv or other info

it starts from the statement date of your next coming statement (current cycle), so the instalment will be added to your next statement balance
however, it is irrelevant to your current cycle cash back cap because it is determined by your opening balance / previous statement balance

well it depends on your statement date
Affin charge on the statement date while MBB charge immediately and subsequently statement date + 1
your '1 day after statement date' is 2nd and subsequent instalments


assuming your statement date is 26th for both Affin and MBB
Affin will charge the first instalment on 26th while MBB will charge today but it would be indifferent as they both will be charged to your current statement