Cities can offer its residents, smart credit/debit cards, where citizens can put money in. Every business in the city and outside should be able to use this card for payment processing.
The benefit of this card is:
1. They can be used for parking meters (so people don't have to run for cash), any city sponsored event, farmer's market, etc.
2. Moreover when people use this card in other cities, the resident city authorities can track and see what are the places/events for which residents have to drive out of city for and try to incorporate those things in their city development plans.
3. Also the card can gave great city specific benefits and perks for using these cards.