The Department of Finance offers payment plans to motorists with outstanding parking, compliance, red light camera or automated speed enforcement violations. The official website of the City of Chicago Department of Finance, otherwise know as the Comptroller's Office.The key systems involved in the procure-to-pay process are BuySite and ePayment. This technology facilitates online credit card payments and other online payment app transactions where a credit card is not physically present. Accept all the ways customers want to pay. Make the sale in-store or online, and take credit cards, EMV chip cards, gift cards, mobile wallets and more. We've compiled seven of the best online payment solutions providers, analyzing their unique services and defining which businesses they suit best. Begin filling out the Payment Request Form. All fields marked with a red asterisk are required. 1.