- Login to GST Portal
- Click on Profile Name and select 'My Profile' from dropdown
- Under Quick Links, click on 'Manage API Access'
- Select Yes to enable API Access for your GSTIN
- Select the desired duration from drop-down - 6 hrs, 12 hrs, 7 days, 30 days
- Click on Confirm
Read step-wise process - GST Portal : Manage API Access