Valid class 2 or class 3 Digital Signature Certificate (DSC) obtained from a DSC provider is needed for GST registration process.
All existing taxpayers and VAT dealers will be given a provisional ID and a password. You first need to create your username and password using this provisional ID and password at the GST Common Portal - www.gst.gov.in.
After obtaining user id and password one need to complete the following step and uploaded needed documents like company Rent agreement, Signatories ID and address proof, Photo all in scanned form. Once submitted using Digital signature one will get a message as
Your Application for Enrollment of Existing Taxpayer in Karnataka is submitted successfully against XXXXXXXXXX & 2017-01-04 12:46:01.869.
The status of Your Provisional ID XXXXXXXXX has been changed from "Provisional" to "Migrated".
Status of Provisional ID will be changed to Active on the date on which Goods and Services Tax Act, 2016 will come into force.
The Register Digital Signature Certificate page is displayed. In the PAN of Authorized Signatory drop-down list, select the PAN of the authorized Signatory that you want to update.