To create GSP username and ID, follow the below steps:
1. Log in to the NIC web portal - https://ewaybill.nic.in/
2. On the left side bar menu, click on "Registration" and then click on "For GSP".
3. In case you had already created any login credentials, you will see the existing GSP. To add register ClearTax as GSP, click on "Add/New".
4. In the "GSP Name" dropdown, select "DEFMACRO SOFTWARE PRIVATE LIMITED" from the list of GSPs.
5. Next, enter your username, password and then click on "Add". Note the username and password created at this step. You will need them later when using the Authentication API.