Kansas City, Mo. ? Three men who were convicted of selling fake diplomatic credentials have been sentenced to federal prison.

The U.S. Attorney’s office in Kansas City says 66-year-old David Robinson of Lawrence, Kan., was sentenced Monday to six years and three months in prison. Daniel Denham, 50, of Kingsville, Mo., and Larry Goodyke, 52, of Henderson, Nev., both received five-year sentences.

All three were found guilty in August.

Customers paid $450 to $2,000 for the cards identifying them as ambassadors. They were told the cards would grant them sovereign status.