You can pay as much as you want until when they consider you in default if they are not paid in full or have auto pay turned on which I believe
@Sandisw is correct with a February 15 date.
According to the “new rules” you can turn off monthly auto pay but the balance becomes due at that point.
I don’t remember if people were able to call MA and pay with multiple gift cards or not as online you could only use one gift card (or so we were informed) which would mean your dues would have to be $1,000 or less at that point since the GC can only hold $1,000.