Hello,
It would be great if there would be an advanced warning that payment is due. I can't pay all christmas, because payment was due on the 23rd. Of course, you will say I should have remembered that myself, but if it is possible for a window to pop up saying you cant play till you pay, it is surely possible to have a window popup saying you have to pay cus the current period ends in a week.
Just my 2 cents