All the while i only make lump sum payment to the principal card.
I called up to check, apparently their system have some problem last month.
The amount paid to principal card did not transfer to supp card account.
Have to call up then they waive all the late payment penalty charges.

Will be paying the full amount.
Next month's bill only will get the waived charges. So pay less next month.

I think that would consider as not making full payment.
Might have penalty on that.

I think as long u didnt make full payment, we will get penalty.
Else everyone would have make minimum payment every month.
U just follow that bill statement will do. Next month u will be paying less anyway.