Yesterday Parkmobile blamed Sen. Dick Durbin (D-Ill.) for an increase in transaction fees that’s hitting users of the pay-by-phone parking app. Today, Durbin fired back, saying that it’s credit card companies that are to blame.

There’s a very slim chance you’ll get a ticket if you use pay-by-phone app Parkmobile, insist company officials.

You can already pay for parking in some parts of D.C. via solar-powered credit card meters, and starting Monday, another pilot program launched by the District Department of Transportation will allow drivers to pay for parking by phone. The pay by phone option is being offered at 700 parking spaces in three areas of the city: around Dupont Circle, Union Station, and downtown on K Street, I Street, and New York Avenue NW. Meters…