To do e-payment of central excise and service tax in India, follow these steps:
Visit the e-payment portal of the Central Board of Indirect Taxes and Customs (CBIC): https://cbic-gst.gov.in
Select the 'Services' tab and click on 'E-Payment' option.
Under the 'E-Payment' option, select the tax type that you wish to pay (Central Excise or Service Tax).
Fill in the necessary details like the taxpayer's name, 15-digit Assessee Code, etc.
Verify the details and proceed to make the payment through the available payment options like net banking, debit card, credit card, NEFT, etc.
After the payment is successful, you will receive a challan with a unique transaction ID. This challan can be downloaded and printed for future reference.
Note: The e-payment portal can also be used to pay other taxes like GST, Customs Duty, and other indirect taxes.