The setting is a small town in the Virginia Tidewater, 1853. The character is the village doc. He's content to take barter for his services from the less-well-off, but he charges money to the plantation owners (he treats both free men and slaves).
Now, when it comes time to collect for his services, would he be given cash? A cheque? A letter of credit to take to the bank? Something else I'm not thinking of?