Only new transactions made after the next billing date, yes?

hello, need some clarification on maybank statement.

i made a purchase on 4/12/20 (ezy payment plan rm200x12)

so on 4/12 there's rm210 (RM200 1st month + RM10 misc ) on the transaction history.
statement date on 14/12/20
due date 3/1/21
-outstanding balance rm210
-statement balance rm210
-minimum payment rm210
on 15/12 there is this another RM200 amount of the installment in the transaction history
-outstanding balance rm410
-statement balance rm210
-minimum payment rm210

i made payment on the statement balance RM210 on 18/12/20
-outstanding balance rm200
-statement balance rm210
-minimum payment rm0
my questions are :
-am i charged twice for the monthly installment and should pay the remaining RM200 on the outstanding?
-or should i just wait for next statement since i already paid the first installment and the minimum payment is already RM0?

thanks in advance 

Yes, the interchange/MDR fee for debit card is very low.

I have a question about 20 days interest free grace period. If I pay my statement balance before due date, there will be no interest charged. If I did not pay all before the due date, interest will be charged on the remaining statement balance and subsequent transactions will no longer be interest free.

When would it reset? Immediately after settling the unpaid statement balance or all outstanding balance (including those not yet statemented)? Or in the next statement cycle after either of the above?

In other words, when will one get to enjoy the 20 days interest free period again?

Mamak also got preauth?

hi guys, any type of bank cc able to get instant transaction notification like maybank does?