Red light camera tickets in the St. Louis County area, regardless of which municipal city it happened in, result in money for the city and the company which owns the camera. On the ticket is a court date and location. This type of ticket is considered enforceable and valid by the Missouri Supreme Court, at this time.
Ignore it, and you will find a warrant for "failure to appear" will be issued for you. You can them be arrested and taken to jail.
Pay it, and you will find you have points assessed to your drivers license.
Suggestion, go to court and talk to the prosecuting attorney before court to see if you can eliminate the points. Or, contact one of those ticket specialty places like the traffic law center, ticket one, or any of the others, and let them handle the case for you.
Worked in Missouri as law enforcement for a while