Paying the fine for overstaying tourist visa.

Hi everyone,
What is the procedure for paying the fine for overstaying a tourist visa? As always there is so much conflicting information that I want to try to get a definitive answer!
Regards. Barney.

you are allowed to pay it when you leave ot on your next return. currently the banks are on strike so it makes it difficult to do so .

Ok,thanks.  I want to pay it before I leave. So if I know for example how many days I  going to overstay, do I just go to the Federal Police, get a form and then pay the fine in a bank? Then I'm good to go to the airport with the proof of payment?