What are some ways to make a CitiBank MasterCard payment?

CitiBank accepts MasterCard payments through a variety of methods, including by mail, over the telephone and online. As of 2015, customers can also make payments through Western Union Quick Pay, explains the CitiBank website.

For immediate credit on a MasterCard bill, customers can pay electronically from a bank account by entering routing and checking account numbers on the CitiBank website. Customers can also link CitiBank checking accounts to their credit card accounts for the convenient transfer of payment funds. To make a telephone payment, customers can call 800-950-5114. Customer service representatives are available 24 hours a day, according to the Citibank website.