Discover, MasterCard and Visa  credit cards are used for online payment. Electronic funds transfer called E-Check is also acceptable in the online payment. 

 When you are paying online, your  transaction will be  conducted using a 128-bit SSL encryption. Which means  a Secured Socket  Layer (SSL) is in place and your card details are  encrypted for  protection, then transmitted in a secret way to ensure every individual's credit  card, e-check and personal data.

Yes, there is a service delivery fee  which includes a fee for using credit cards and e-checks.  You are requested to pay through cards which are having some extra amount related to the tax bill.