Fish the three numbers out of your postal code, enter those, and "00" afterwards.
For example, if your postal code is A1B 2C3 then enter "12300"
Sometimes it works, sometimes it doesn't.
This has worked everytime for me.
Prepay in cash. Works every time.
Sure, get off bike, remove helmet gloves, dig out wallet, pay. Go back to bike fill up. Go back to get cash and then gear up.
vs remove gloves and dig out wallet.
Postal code trick is 10000000 times easier IMO.