CBIC recently added, “E-payment of central excise duty which is due by May 06, 2019 can be made as usual through Electronic Accounting System in Excise and Service Tax (“EASIEST”) portal. E-payment of service tax dues can also be made similarly through the EASIEST portal”
EASIEST is a web-based payment gateway launched by CBEC in 2007 enabling the assessee to pay Central Excise duties and Service Tax online w.e.f. October 01, 2014, the Central Board of Excise and Customs had made it mandatory for payment of tax/duty electronically through internet banking for all Central Excise and Service Tax Assessees both dated 11th July 2014, except in exceptional cases to be recorded by Divisional Assistant / Deputy Commissioners.
Easiest portal: https://cbec-easiest.gov.in/EST/InputPageForEPaymentServlet.