How do I pay for a citation issued in the city of Riverdale Georgia?

You can pay for a citation in Riverdale GA online with Visa, MasterCard, or American Express; in person at the Clerk of Court Office with Visa, MasterCard, American Express, debit card, or cash; or by mail with a money order. All of the details are on the court's website, which is the first related link below; it includes a link to the online payment system.

I found this at the second related link below, which has the court's contact information and a link to its website. This is just the Clayton County page; you can find such info for any court in GA by selecting a county - or for any court in the nation by selecting a state and county.