Montgomery County currently has two vendors that allow customers the option of a pre-funded ""wallet"" or a ""pay as you go"" option. The wallet option allows customers to fund an account in advance and deduct funds with each future transaction. Wallet customers will be charged a $0.25 transaction fee. The ""pay as you go"" option charges a credit card on file for each transaction. Pay as you go customers will be charged a $0.35 transaction fee with Passport and a $0.45 transaction fee with Parkmobile. Passport is now available in Bethesda Garages and Lot 25. In Silver Spring Garages 3, 5, 7, 9, 16, 58, and Lot 29, and Wheaton Garages 13 and 45 and Lot 13.