By far the worst when it comes to this is;The GM Card your due date is say on Mon but unless you remember how they process the payments you will Killed with fees and penalities. In order for it to make on time for a Mon due date you need to pay it by the previous Weds, as weekends dont count, they say Credit to the acct takes 2 biz days, and it must be in before the due date, ifit gets credited on the due date its as if it was late.