Believe it or not, this is a question that we get all the time.
Often, clients wait until the last minute to pay, and then are suprised that there is no way to pay CRA on a last minute deadline.
There are a few options, but they can be limiting.
AT THE BANK:
You need to have the original slip if you go to the bank. If you don't have the ORIGINAL (apparently the ink is magnetic), then the bank will not take your money. How do you get an original slip? Well, you either have to log in to your CRA account - if you have one - or else...