If you want to do a GST Suvidha Center login, you must visit your GST Suvidha official site. And follow the below steps.
Check your mail you have received the login url with the password and user id.
Now click on the url
Fill username and password.
That's it, now you can access all the 500+ services to serve your customer according to their needs.
Official Site: https://www.gstsuvidhakendra.net/gst-suvidha-center/