had a mix up with paying a parking ticket online and called 311 to straighten it out. she told me to log in to nyc.gov/finance>dispute parking ticket. after i entered my violation number it automatically reduced the fine from $45 (it was a 35 with a 10 late fine) to $26. Just for asking! She said it wont work on some violations like blocking a hydrant or walkway, but always for meter fines. Pretty cool, huh?